Pub Date : 2024-12-25DOI: 10.1016/j.dyepig.2024.112621
Jie Hua , Lijun Qi , Zeyuan Cheng , Zhuolin Zhan , Yuan Chai , He Dong , Jin Wang
The exciplex-forming co-host system has demonstrated significant potential in the development of high-efficiency white organic light-emitting diodes (WOLEDs). However, there have been limited investigations into the electroluminescence (EL) performance of WOLEDs utilizing exciplex-forming co-hosts with varying electron donor/electron acceptor mixing ratios. In this work, we fabricated two complementary-color WOLEDs by employing PO-01-TB doped in the mCP:PO-T2T exciplex-forming co-host and FIrpic doped mCP host as the orange and the blue emission layers, respectively. The effects of various mixing ratios of mCP:PO-T2T on device performance were explored. It was observed that decreasing the PO-T2T content resulted in a blue shift in the emission peak, indicating an increase in the energy of the mCP:PO-T2T exciplex. The enhancement facilitates the energy transfer to the blue phosphor FIrpic, thereby improving the exciton utilization and reducing efficiency roll-off at high luminance. By optimizing the device structure, the all-phosphorescent warm WOLED using mCP:PO-T2T (2:1) exciplex host was achieved with a maximum EQE of 21.1 %, which remained 20.6 % at 100 cd/m2 and 18.4 % at 1000 cd/m2, demonstrating high EQE and low efficiency roll-off.
{"title":"High efficiency and low roll-off white phosphorescent organic light-emitting diodes by employing various acceptor ratio in exciplex-forming co-host","authors":"Jie Hua , Lijun Qi , Zeyuan Cheng , Zhuolin Zhan , Yuan Chai , He Dong , Jin Wang","doi":"10.1016/j.dyepig.2024.112621","DOIUrl":"10.1016/j.dyepig.2024.112621","url":null,"abstract":"<div><div>The exciplex-forming co-host system has demonstrated significant potential in the development of high-efficiency white organic light-emitting diodes (WOLEDs). However, there have been limited investigations into the electroluminescence (EL) performance of WOLEDs utilizing exciplex-forming co-hosts with varying electron donor/electron acceptor mixing ratios. In this work, we fabricated two complementary-color WOLEDs by employing PO-01-TB doped in the mCP:PO-T2T exciplex-forming co-host and FIrpic doped mCP host as the orange and the blue emission layers, respectively. The effects of various mixing ratios of mCP:PO-T2T on device performance were explored. It was observed that decreasing the PO-T2T content resulted in a blue shift in the emission peak, indicating an increase in the energy of the mCP:PO-T2T exciplex. The enhancement facilitates the energy transfer to the blue phosphor FIrpic, thereby improving the exciton utilization and reducing efficiency roll-off at high luminance. By optimizing the device structure, the all-phosphorescent warm WOLED using mCP:PO-T2T (2:1) exciplex host was achieved with a maximum EQE of 21.1 %, which remained 20.6 % at 100 cd/m<sup>2</sup> and 18.4 % at 1000 cd/m<sup>2</sup>, demonstrating high EQE and low efficiency roll-off.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112621"},"PeriodicalIF":4.1,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-24DOI: 10.1016/j.dyepig.2024.112619
Kyeong-Ho Seo , Swarup Biswas , Yongju Lee , Philippe Lang , Dohyeon Gil , Minsu Choi , Jin-Hyuk Bae , Hyeok Kim
As the push to enhance power conversion efficiency (PCE) in solar cells intensifies, tandem configurations that integrate photovoltaic devices with complementary bandgaps have become essential. Perovskite materials are particularly advantageous in these tandem solar cells due to their adjustable bandgaps (ranging from 1.2 to 2.2 eV), superior light absorption, remarkable structural stability, and efficient charge-carrier mobility. Lead-free perovskites offer the benefits of traditional perovskites while also being nontoxic and stable; thus, they are ideal candidates for tandem solar cells. However, the optical loss associated with light reflection from the upper surface of the cell degrades device performance, thus reducing the PCE of solar cells; therefore, continuous research efforts are needed to address this drawback. In this study, we coated a lead-free all-perovskite tandem solar cell with a parabolic zinc oxide (ZnO) moth-eye antireflection (AR) layer and assessed its efficiency in suppressing reflection using the two-dimensional finite-difference time-domain method. We analyzed the maximum short-circuit current density (Jsc,max) of the lead-free all-perovskite tandem solar cell by varying the height (H) of the ZnO moth-eye AR layer. Notably, for H = 300 nm, Jsc,max was about 30.5 mA/cm2, which indicated that 300 nm was the optimal height for performance improvement. Moreover, we generated a profile for the light-trapping phenomenon that occurs within an actual cell by simulating the electromagnetic mechanism governing the generation rate and proportion of absorbed photons. This profile enabled us to characterize the light-trapping phenomenon within the tandem solar cell induced by the ZnO moth-eye AR layer.
{"title":"Uncovering the underlying electromagnetic mechanism of lead-free all-perovskite tandem solar cells with ZnO moth-eye antireflection layers","authors":"Kyeong-Ho Seo , Swarup Biswas , Yongju Lee , Philippe Lang , Dohyeon Gil , Minsu Choi , Jin-Hyuk Bae , Hyeok Kim","doi":"10.1016/j.dyepig.2024.112619","DOIUrl":"10.1016/j.dyepig.2024.112619","url":null,"abstract":"<div><div>As the push to enhance power conversion efficiency (PCE) in solar cells intensifies, tandem configurations that integrate photovoltaic devices with complementary bandgaps have become essential. Perovskite materials are particularly advantageous in these tandem solar cells due to their adjustable bandgaps (ranging from 1.2 to 2.2 eV), superior light absorption, remarkable structural stability, and efficient charge-carrier mobility. Lead-free perovskites offer the benefits of traditional perovskites while also being nontoxic and stable; thus, they are ideal candidates for tandem solar cells. However, the optical loss associated with light reflection from the upper surface of the cell degrades device performance, thus reducing the PCE of solar cells; therefore, continuous research efforts are needed to address this drawback. In this study, we coated a lead-free all-perovskite tandem solar cell with a parabolic zinc oxide (ZnO) moth-eye antireflection (AR) layer and assessed its efficiency in suppressing reflection using the two-dimensional finite-difference time-domain method. We analyzed the maximum short-circuit current density (J<sub>sc,max</sub>) of the lead-free all-perovskite tandem solar cell by varying the height (H) of the ZnO moth-eye AR layer. Notably, for H = 300 nm, J<sub>sc,max</sub> was about 30.5 mA/cm<sup>2</sup>, which indicated that 300 nm was the optimal height for performance improvement. Moreover, we generated a profile for the light-trapping phenomenon that occurs within an actual cell by simulating the electromagnetic mechanism governing the generation rate and proportion of absorbed photons. This profile enabled us to characterize the light-trapping phenomenon within the tandem solar cell induced by the ZnO moth-eye AR layer.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112619"},"PeriodicalIF":4.1,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-24DOI: 10.1016/j.dyepig.2024.112620
Xiao-Chong Ma, Dao-Wei Li, Zheng-Rong Mo, Zhi-Gang Niu, Gao-Nan Li
Herein, a new series of deep-red phosphorescent cyclometalated iridium(III) complexes (Ir-1∼Ir-3) with 2-(benzothienyl)pyridine derivatives (R-btp) as cyclometalated ligands and tetraphenylimidodiphosphinate (tpip) as ancillary ligands were synthesized and fully characterized. The crystal structures of three complexes were determined by X-ray analysis, displaying multiple π … π and C–H … π interactions. Their structures and photophysical properties were systematically investigated with experimental and theoretical methods. The results reveal complex Ir-3 functionalized with the CF3 groups exhibits a remarkable red-shifted and a higher quantum yield compared to fluorinated complexes Ir-1 and Ir-2. As expected, the deep-red organic light-emitting diodes (OLEDs) device D-3 using Ir-3 as the emitting layer achieves the best electroluminescent performance with a promising maximum external quantum efficiency (EQEmax) of 11.3 %, accompanied by CIE coordinates of (0.67, 0.33) and narrow full width at half maximum (FWHM) of 41 nm. It is anticipated that this research could provide a rational design strategy for pure deep-red-emitting phosphorescent iridium complexes in the fabrication of high-efficiency OLEDs.
{"title":"Rational design and characterization of efficient deep-red iridium(III) complexes with 2-(benzothienyl)pyridine and tetraphenylimidodiphosphinate ligands","authors":"Xiao-Chong Ma, Dao-Wei Li, Zheng-Rong Mo, Zhi-Gang Niu, Gao-Nan Li","doi":"10.1016/j.dyepig.2024.112620","DOIUrl":"10.1016/j.dyepig.2024.112620","url":null,"abstract":"<div><div>Herein, a new series of deep-red phosphorescent cyclometalated iridium(III) complexes (<strong>Ir</strong>-<strong>1</strong>∼<strong>Ir</strong>-<strong>3</strong>) with 2-(benzothienyl)pyridine derivatives (R-btp) as cyclometalated ligands and tetraphenylimidodiphosphinate (tpip) as ancillary ligands were synthesized and fully characterized. The crystal structures of three complexes were determined by X-ray analysis, displaying multiple π … π and C–H … π interactions. Their structures and photophysical properties were systematically investigated with experimental and theoretical methods. The results reveal complex <strong>Ir</strong>-<strong>3</strong> functionalized with the CF<sub>3</sub> groups exhibits a remarkable red-shifted and a higher quantum yield compared to fluorinated complexes <strong>Ir</strong>-<strong>1</strong> and <strong>Ir</strong>-<strong>2</strong>. As expected, the deep-red organic light-emitting diodes (OLEDs) device <strong>D</strong>-<strong>3</strong> using <strong>Ir</strong>-<strong>3</strong> as the emitting layer achieves the best electroluminescent performance with a promising maximum external quantum efficiency (<em>EQE</em><sub><em>max</em></sub>) of 11.3 %, accompanied by CIE coordinates of (0.67, 0.33) and narrow full width at half maximum (FWHM) of 41 nm. It is anticipated that this research could provide a rational design strategy for pure deep-red-emitting phosphorescent iridium complexes in the fabrication of high-efficiency OLEDs.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112620"},"PeriodicalIF":4.1,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-24DOI: 10.1016/j.dyepig.2024.112618
Jinting Shang , Lufang Su , Liping Li , Xin Yu , Yan Yang , Chen Wang , Jingran Wang , Xuannan Zhang , Yuran Gui , Wei Liu , Yiyuan Xia , Xiji Shu , Yibin Zhang
The radiotoxicity and chemical toxicity of UO₂2⁺ pose a long-term threat to ecosystems and human health through bioaccumulation and biomagnification. Therefore, there is an urgent need to develop highly sensitive and selective detection methods for UO₂2⁺. Here, we developed a near-infrared (NIR) fluorescent probe RU, built on a xanthene core structure. Upon binding with UO₂2⁺, RU undergoes ring-opening, triggering fluorescence turn on. RU exhibited high selectivity, sensitivity, and rapid response toward UO₂2⁺. Besides, we have successfully employed RU to visualize UO₂2⁺ in the blood of mice's eyeballs for the first time, providing a valuable method to investigate its biological behavior and toxicity in living system.
{"title":"A novel xanthene-based NIR fluorescent probe for the high-sensitivity detection of UO₂2⁺ in the blood from mice eyeballs","authors":"Jinting Shang , Lufang Su , Liping Li , Xin Yu , Yan Yang , Chen Wang , Jingran Wang , Xuannan Zhang , Yuran Gui , Wei Liu , Yiyuan Xia , Xiji Shu , Yibin Zhang","doi":"10.1016/j.dyepig.2024.112618","DOIUrl":"10.1016/j.dyepig.2024.112618","url":null,"abstract":"<div><div>The radiotoxicity and chemical toxicity of UO₂<sup>2</sup>⁺ pose a long-term threat to ecosystems and human health through bioaccumulation and biomagnification. Therefore, there is an urgent need to develop highly sensitive and selective detection methods for UO₂<sup>2</sup>⁺. Here, we developed a near-infrared (NIR) fluorescent probe <strong>RU</strong>, built on a xanthene core structure. Upon binding with UO₂<sup>2</sup>⁺, <strong>RU</strong> undergoes ring-opening, triggering fluorescence turn on. <strong>RU</strong> exhibited high selectivity, sensitivity, and rapid response toward UO₂<sup>2</sup>⁺. Besides, we have successfully employed <strong>RU</strong> to visualize UO₂<sup>2</sup>⁺ in the blood of mice's eyeballs for the first time, providing a valuable method to investigate its biological behavior and toxicity in living system.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112618"},"PeriodicalIF":4.1,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-24DOI: 10.1016/j.dyepig.2024.112615
Ting Qi , Shuai Guo , Dongjiao Wang , Linkuo Li , Yanwei Liu , Yunqi Liu
The assembly behavior and the development in circularly polarized luminescence (CPL) materials of axially chiral molecules have become an attractive research topic in material chemistry. This study reports the facile syntheses of 3,3′-bibenzo[b]thiophene and its thienyl-S,S-dioxidized derivatives modified with N-phenylcarbazole and triphenylamine, respectively. The obtained four compounds display blue-to-red luminescence with large Stokes shifts. Single-crystal structure analysis showed the first example of a double helix-like assembly of axially chiral molecules for triphenylamine-modified bis-S,S-dioxide (rac)-DBTOTPA. DBTOTPA also exhibited excellent optical properties, with the maximum quantum yield (ΦPL) reaching 50 % in solution, which could be attributed to the enhanced intramolecular charge transfer (ICT) interactions due to the synergistic action of sulfur oxidation and triphenylamine donor. 1 % DBTOTPA-doped PMMA film also showed a quite high ΦPL value up to 97 %. The (P)- and (M)-enantiomers of DBTOTPA exhibited remarkable orange and deep-red CPL performance in toluene/PMMA film and neat film, respectively, with the luminescence dissymmetry factor (|glum|) of over 1 × 10−3. This work opens a new avenue for designing and synthesizing novel organic CPL emitters with new assembly forms and intensively chiroptical activities.
{"title":"Double helix-like assembly of axially chiral 3,3′-Bi(benzo[b]thiophene-S,S-dioxide) Derivative in crystals and circularly polarized luminescence","authors":"Ting Qi , Shuai Guo , Dongjiao Wang , Linkuo Li , Yanwei Liu , Yunqi Liu","doi":"10.1016/j.dyepig.2024.112615","DOIUrl":"10.1016/j.dyepig.2024.112615","url":null,"abstract":"<div><div>The assembly behavior and the development in circularly polarized luminescence (CPL) materials of axially chiral molecules have become an attractive research topic in material chemistry. This study reports the facile syntheses of 3,3′-bibenzo[<em>b</em>]thiophene and its thienyl-<em>S</em>,<em>S</em>-dioxidized derivatives modified with <em>N</em>-phenylcarbazole and triphenylamine, respectively. The obtained four compounds display blue-to-red luminescence with large Stokes shifts. Single-crystal structure analysis showed the first example of a double helix-like assembly of axially chiral molecules for triphenylamine-modified bis-<em>S</em>,<em>S</em>-dioxide (<em>rac</em>)-<strong>DBTOTPA</strong>. <strong>DBTOTPA</strong> also exhibited excellent optical properties, with the maximum quantum yield (<em>Φ</em><sub>PL</sub>) reaching 50 % in solution, which could be attributed to the enhanced intramolecular charge transfer (ICT) interactions due to the synergistic action of sulfur oxidation and triphenylamine donor. 1 % <strong>DBTOTPA</strong>-doped PMMA film also showed a quite high <em>Φ</em><sub>PL</sub> value up to 97 %. The (<em>P</em>)- and (<em>M</em>)-enantiomers of <strong>DBTOTPA</strong> exhibited remarkable orange and deep-red CPL performance in toluene/PMMA film and neat film, respectively, with the luminescence dissymmetry factor (|<em>g</em><sub>lum</sub>|) of over 1 × 10<sup>−3</sup>. This work opens a new avenue for designing and synthesizing novel organic CPL emitters with new assembly forms and intensively chiroptical activities.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112615"},"PeriodicalIF":4.1,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.dyepig.2024.112613
Jie Xie , Gang Song , Fengting Lv
Natural products have good potential in the photodynamic therapy (PDT) of clinical diseases such as cancer. As a photosensitizer with excellent properties, natural hypocrellins have attracted more and more attention. In this work, a novel one-step strategy for efficient synthesis of three phaeosphaerin derivatives (PHDs) based on natural hypocrellins has been reported. Single crystal structure analysis results indicate all PHDs retained the key structural skeleton of perylenequinone except that the twisted seven-membered side ring is altered by a planar five-membered ring. PHDs exhibit strong singlet oxygen generation ability (PH446 up to 100 %). The prepared PH446 nanoparticle is highly biocompatible without irradiation and can generate abundant reactive oxygen species in HeLa cells after 20-min white light irradiation, which cause more than 90 % cell death. Therefore, this synthesis strategy demonstrates a new perspective on the development of new generation of perylenequinones for photodynamic therapy agents.
{"title":"One-step synthesis of novel phaeosphaerin derivatives for photocytotoxicity","authors":"Jie Xie , Gang Song , Fengting Lv","doi":"10.1016/j.dyepig.2024.112613","DOIUrl":"10.1016/j.dyepig.2024.112613","url":null,"abstract":"<div><div>Natural products have good potential in the photodynamic therapy (PDT) of clinical diseases such as cancer. As a photosensitizer with excellent properties, natural hypocrellins have attracted more and more attention. In this work, a novel one-step strategy for efficient synthesis of three phaeosphaerin derivatives (PHDs) based on natural hypocrellins has been reported. Single crystal structure analysis results indicate all PHDs retained the key structural skeleton of perylenequinone except that the twisted seven-membered side ring is altered by a planar five-membered ring. PHDs exhibit strong singlet oxygen generation ability (PH446 up to 100 %). The prepared PH446 nanoparticle is highly biocompatible without irradiation and can generate abundant reactive oxygen species in HeLa cells after 20-min white light irradiation, which cause more than 90 % cell death. Therefore, this synthesis strategy demonstrates a new perspective on the development of new generation of perylenequinones for photodynamic therapy agents.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112613"},"PeriodicalIF":4.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.dyepig.2024.112612
Nicolas Mast, Ludmilla Verrieux, William Erb, Nicolas Richy, Olivier Mongin, Jean Pierre Hurvois, Thierry Roisnel, Arnaud Fihey, Boris Le Guennic, Florence Mongin
Ceramidonine analogues and fused 3,9-diazaperylenes were synthesised from aminoanthraquinones and 2-iodinated heteroaromatics by a copper-promoted N-arylation-cyclisation sequence. Their photophysical properties, determined experimentally and analysed through computation, revealed either efficient photosensitisers or fluorescent compounds, respectively.
{"title":"Indole-, benzofuran- and benzothiophene-containing analogues of ceramidonines and fused 3,9-diazaperylenes: Synthesis and physicochemical properties of these new polycyclic azaarenes","authors":"Nicolas Mast, Ludmilla Verrieux, William Erb, Nicolas Richy, Olivier Mongin, Jean Pierre Hurvois, Thierry Roisnel, Arnaud Fihey, Boris Le Guennic, Florence Mongin","doi":"10.1016/j.dyepig.2024.112612","DOIUrl":"10.1016/j.dyepig.2024.112612","url":null,"abstract":"<div><div>Ceramidonine analogues and fused 3,9-diazaperylenes were synthesised from aminoanthraquinones and 2-iodinated heteroaromatics by a copper-promoted <em>N</em>-arylation-cyclisation sequence. Their photophysical properties, determined experimentally and analysed through computation, revealed either efficient photosensitisers or fluorescent compounds, respectively.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112612"},"PeriodicalIF":4.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.dyepig.2024.112610
MeiTing Luo , JiangXue Pei , BoHua Zhang , ZhiQiang Wang , Yi Chen , QingYu Jia , XiPing Lei , Zhaoxin Wu , XinWen Zhang , DongDong Wang
Recently, much research effort has been devoted to design emitter molecules with high horizontal dipole ratios to enhance optical coupling output efficiency of organic light-emitting devices (OLEDs), while less attention focused on designing host material to endow it with favorable horizontal dipole orientation. Five host materials dBF-Ph, 4dBF-Cz, dBF-dCz, 3dBF-Cz and tBF-Ph have been developed for blue emitters employing benzo [b]furan as key constructing unit. The benzo [b]furan could endow the resulting host materials with bipolar charge transport characteristics, high singlet and triplet energy level due to its electron-withdrawing property and small conjugate length. When using our developed 2356fTPA-BF as blue fluorescent emitter (λem = 446 nm, ΦPL = 98 %), the host materials 3dBF-Cz could adjust horizontal dipole ratios of blue emitter to be as high as 96 %. This enables blue fluorescent OLED to achieve an external quantum efficiency of 6.6 % and current efficiency of 5.9 cd A−1, respectively. This research highlights the important role of the host molecular design for improving molecular horizontal dipole orientation, as well as promising potential of benzofuran as important building unit for realizing bipolar host materials.
{"title":"Benzo[b]furan-based host materials for blue fluorescent emitter to achieve an external quantum efficiency of 6.6 % in organic light-emitting device","authors":"MeiTing Luo , JiangXue Pei , BoHua Zhang , ZhiQiang Wang , Yi Chen , QingYu Jia , XiPing Lei , Zhaoxin Wu , XinWen Zhang , DongDong Wang","doi":"10.1016/j.dyepig.2024.112610","DOIUrl":"10.1016/j.dyepig.2024.112610","url":null,"abstract":"<div><div>Recently, much research effort has been devoted to design emitter molecules with high horizontal dipole ratios to enhance optical coupling output efficiency of organic light-emitting devices (OLEDs), while less attention focused on designing host material to endow it with favorable horizontal dipole orientation. Five host materials <strong>dBF-Ph</strong>, <strong>4</strong><strong>dB</strong><strong>F-Cz</strong>, <strong>dBF-dCz</strong>, <strong>3</strong><strong>dB</strong><strong>F-Cz</strong> and <strong>tBF-Ph</strong> have been developed for blue emitters employing benzo [<em>b</em>]furan as key constructing unit. The benzo [<em>b</em>]furan could endow the resulting host materials with bipolar charge transport characteristics, high singlet and triplet energy level due to its electron-withdrawing property and small conjugate length. When using our developed <strong>2356fTPA-BF</strong> as blue fluorescent emitter (λ<sub>em</sub> = 446 nm, Φ<sub>PL</sub> = 98 %), the host materials <strong>3</strong><strong>dB</strong><strong>F-Cz</strong> could adjust horizontal dipole ratios of blue emitter to be as high as 96 %. This enables blue fluorescent OLED to achieve an external quantum efficiency of 6.6 % and current efficiency of 5.9 cd A<sup>−1</sup>, respectively. This research highlights the important role of the host molecular design for improving molecular horizontal dipole orientation, as well as promising potential of benzofuran as important building unit for realizing bipolar host materials.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112610"},"PeriodicalIF":4.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-19DOI: 10.1016/j.dyepig.2024.112611
Xiaona Zhai , Song Yang , Shuai Wang , Pengcheng Wang , Debin Ji
DNAzymes have gained various applications in scientific fields, but their practical uses in everyday life are still being investigated. Hair dyeing, a popular cosmetic practice, still poses potential health risks, owing to the toxicity of commercial hair dyes. In this study, we assessed the feasibility of DNAzyme-catalyzed hair dyeing using natural pigments. We found that DNAzymes of peroxidase activity can expedite dopamine polymerization, resulting in the black coloration of human hair in around half an hour. This process can be achieved by using the milder Tris buffer to substitute the NH4OH with 0.1 mM H2O2. In addition, these DNAzymes can catalyze the polymerization of other natural pigments. Thus, our mild and rapid hair dyeing approach has the potential to substitute traditional harsh hair dyeing conditions and also provides new insights into the field of DNAzyme applications.
{"title":"Hair dyeing based on DNAzyme-catalyzed oxidation of dopamine and natural pigments","authors":"Xiaona Zhai , Song Yang , Shuai Wang , Pengcheng Wang , Debin Ji","doi":"10.1016/j.dyepig.2024.112611","DOIUrl":"10.1016/j.dyepig.2024.112611","url":null,"abstract":"<div><div>DNAzymes have gained various applications in scientific fields, but their practical uses in everyday life are still being investigated. Hair dyeing, a popular cosmetic practice, still poses potential health risks, owing to the toxicity of commercial hair dyes. In this study, we assessed the feasibility of DNAzyme-catalyzed hair dyeing using natural pigments. We found that DNAzymes of peroxidase activity can expedite dopamine polymerization, resulting in the black coloration of human hair in around half an hour. This process can be achieved by using the milder Tris buffer to substitute the NH<sub>4</sub>OH with 0.1 mM H<sub>2</sub>O<sub>2</sub>. In addition, these DNAzymes can catalyze the polymerization of other natural pigments. Thus, our mild and rapid hair dyeing approach has the potential to substitute traditional harsh hair dyeing conditions and also provides new insights into the field of DNAzyme applications.</div></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"235 ","pages":"Article 112611"},"PeriodicalIF":4.1,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-18DOI: 10.1016/j.dyepig.2024.112608
Petra Maleš, Zlatko Brkljača , Tomislav Portada, Danijela Bakarić, Ivo Crnolatac
The two fluorescent probes 2-(2-bromoethoxy)-9,10-diphenylanthracene and 9,10-diphenylanthracene were evaluated for their suitability to report temperature-induced phase transitions in phospholipid formulations. Multilamellar liposomes were formed from two different lipids, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine and the probes were embedded in the bilayers. The fluorescence spectra of the embedded probes were collected over the temperature range of the lipid phase transitions. The transition temperatures were determined by differential scanning calorimetry and temperature-dependent fluorescence spectroscopy. The fluorescence lifetimes of the emitting species were calculated by time-resolved fluorescent spectroscopy in gel and fluid phases. The molecular dynamics simulations were employed to describe the impact of the probe positioning within the bilayer on their emitting properties. The probes did not significantly impact the physicochemical characteristics of the vesicles. Both probes can report on main lipid phase transitions in the two types of liposomes. However, upon transition from gel to fluid phase, the emitting species show longer-lived fluorescence.
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