Chin-Yiu Chan, Yi‐Ting Lee, Youichi Tsuchiya, H. Nakanotani, C. Adachi
Organic light-emitting diodes (OLEDs) are a promising light-emitting technology useful for various display applications1,2. Despite great progress in this field3-12, there is an ongoing challenge to realize high performance blue OLEDs with efficiency, good color purity, and device lifetime. Here, we report pure-blue (CIEx,y color coordinates of [0.13, 0.16]) OLEDs with high-efficiency (external quantum efficiency of 32 % at 1000 cd m–2 ), narrow-emission (full width half maximum of 19 nm), and good stability (LT95 of 18 hours at an initial luminance of 1000 cd m–2 ). The design is based on a two-unit stacked tandem hyperfluorescence (HF)-OLED with an improved singlet-excited energy transfer process from a sky-blue TADF assistant dopant (AD) (HDT-1) to a pure-blue terminal emitter (TE) (v-DABNA). Furthermore, the effect of dopant concentration of terminal emitter on the device performance of hyperfluorescence OLEDs is studied. Device shows a better color purity when dopant concentration is increased. On the other hand, new hyperfluorescence OLEDs have been fabricated, in which device stability has been extended with a new molecular design of TE.
有机发光二极管(oled)是一种很有前途的发光技术，可用于各种显示应用1,2。尽管该领域取得了很大进展，但实现高效、高颜色纯度和器件寿命的高性能蓝色oled仍然存在挑战。在这里，我们报道了纯蓝色(CIEx,y色坐标为[0.13,0.16])oled，具有高效率(在1000 cd m-2时外量子效率为32%)，窄发射(全宽度一半最大值为19 nm)和良好的稳定性(在1000 cd m-2的初始亮度下LT95为18小时)。该设计基于双单元堆叠串联高荧光(HF)-OLED，具有改进的单重激发能量转移过程，从天蓝色TADF辅助掺杂剂(AD) (HDT-1)到纯蓝色终端发射器(TE) (v-DABNA)。进一步研究了终端发射极掺杂剂浓度对高荧光oled器件性能的影响。随着掺杂剂浓度的增加，器件的颜色纯度也随之提高。另一方面，制备了新的高荧光oled，其中新的TE分子设计扩展了器件的稳定性。
{"title":"High-efficiency and stable blue hyperfluorescence organic light-emitting diode","authors":"Chin-Yiu Chan, Yi‐Ting Lee, Youichi Tsuchiya, H. Nakanotani, C. Adachi","doi":"10.1117/12.2632333","DOIUrl":"https://doi.org/10.1117/12.2632333","url":null,"abstract":"Organic light-emitting diodes (OLEDs) are a promising light-emitting technology useful for various display applications1,2. Despite great progress in this field3-12, there is an ongoing challenge to realize high performance blue OLEDs with efficiency, good color purity, and device lifetime. Here, we report pure-blue (CIEx,y color coordinates of [0.13, 0.16]) OLEDs with high-efficiency (external quantum efficiency of 32 % at 1000 cd m–2 ), narrow-emission (full width half maximum of 19 nm), and good stability (LT95 of 18 hours at an initial luminance of 1000 cd m–2 ). The design is based on a two-unit stacked tandem hyperfluorescence (HF)-OLED with an improved singlet-excited energy transfer process from a sky-blue TADF assistant dopant (AD) (HDT-1) to a pure-blue terminal emitter (TE) (v-DABNA). Furthermore, the effect of dopant concentration of terminal emitter on the device performance of hyperfluorescence OLEDs is studied. Device shows a better color purity when dopant concentration is increased. On the other hand, new hyperfluorescence OLEDs have been fabricated, in which device stability has been extended with a new molecular design of TE.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123183263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nucleic acid analysis is one of the most promising approaches in modern diagnostics, however it usually requires expensive amplification equipment. In this study, we propose and approve a method for bacterial pathogens detection and genotyping using a molecular probe-based biosensor without amplification. The sensor consists of a molecular beacon probe as a signal reporter with a fluorophore and a quencher attached to it, and two DNA strands, which have fragments complementary to the reporter and to the analyzed nucleic acid (analyte). The M. tuberculosis HigA1 gene was detected using this sensor, and a point mutation associated with antibiotic resistance was discriminated. As an additional demonstration of the applicability of the method without amplification, E.Coli 16S rRNA was detected. Amplification-free sample detection has been further tested and achieved.
{"title":"Mycobacterium tuberculosis detection and genotyping using molecular probe-based biosensor","authors":"M. Berezovskaya, D. Gorbenko","doi":"10.1117/12.2634320","DOIUrl":"https://doi.org/10.1117/12.2634320","url":null,"abstract":"Nucleic acid analysis is one of the most promising approaches in modern diagnostics, however it usually requires expensive amplification equipment. In this study, we propose and approve a method for bacterial pathogens detection and genotyping using a molecular probe-based biosensor without amplification. The sensor consists of a molecular beacon probe as a signal reporter with a fluorophore and a quencher attached to it, and two DNA strands, which have fragments complementary to the reporter and to the analyzed nucleic acid (analyte). The M. tuberculosis HigA1 gene was detected using this sensor, and a point mutation associated with antibiotic resistance was discriminated. As an additional demonstration of the applicability of the method without amplification, E.Coli 16S rRNA was detected. Amplification-free sample detection has been further tested and achieved.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"12212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130830861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The availability of printable dielectric materials and their printability is one of the major roadblocks to printed flexible electronics. Here, we report the performance of fully printed field-effect transistors using polyvinyl alcohol (PVA) as dielectric and carbon nanotube (CNT) as a semiconducting layer. As fewer numbers of research are available on printed PVA films, here we investigate ink formulation and printing parameters for PVA and their effects on device performances. Aerosol jet Printer was used to obtain a highly dense CNT network and pinhole-free thin PVA dielectric layer that resulted in a high on/off ratio and drain current. This completely printed transistor with polymer dielectric will be a great contribution to flexible electronic devices.
{"title":"Completely printed flexible carbon nanotube based transistor using poly-vinyl alcohol (PVA) as gate dielectric via aerosol jet printing","authors":"B. Mishra, C. Howlader, Yihong Chen","doi":"10.1117/12.2633716","DOIUrl":"https://doi.org/10.1117/12.2633716","url":null,"abstract":"The availability of printable dielectric materials and their printability is one of the major roadblocks to printed flexible electronics. Here, we report the performance of fully printed field-effect transistors using polyvinyl alcohol (PVA) as dielectric and carbon nanotube (CNT) as a semiconducting layer. As fewer numbers of research are available on printed PVA films, here we investigate ink formulation and printing parameters for PVA and their effects on device performances. Aerosol jet Printer was used to obtain a highly dense CNT network and pinhole-free thin PVA dielectric layer that resulted in a high on/off ratio and drain current. This completely printed transistor with polymer dielectric will be a great contribution to flexible electronic devices.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121030667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Sasaki, Takaaki Yagami, Toshinobu Takashi, Kai Suzuki, Gouta Ikeda, Y. Ishii, K. Le, Y. Naka
The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic measurement. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, are known to exhibit a fast photorefractive effect. The principle of the ultrasonic measurement is that a nanosecond laser pulse is shot on an object to cause an ultrasonic vibration, a continuous laser beam is irradiated on the object, and the ultrasonic variation is detected using photorefractive two-beam coupling. This method can be used to investigate the thickness and the internal structure of an object without contact.
{"title":"Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing","authors":"T. Sasaki, Takaaki Yagami, Toshinobu Takashi, Kai Suzuki, Gouta Ikeda, Y. Ishii, K. Le, Y. Naka","doi":"10.1117/12.2633374","DOIUrl":"https://doi.org/10.1117/12.2633374","url":null,"abstract":"The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic measurement. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, are known to exhibit a fast photorefractive effect. The principle of the ultrasonic measurement is that a nanosecond laser pulse is shot on an object to cause an ultrasonic vibration, a continuous laser beam is irradiated on the object, and the ultrasonic variation is detected using photorefractive two-beam coupling. This method can be used to investigate the thickness and the internal structure of an object without contact.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122551605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lukas M. Bongartz, Matteo Cucchi, K. Leo, H. Kleemann
Due to their synaptic functionality based on interacting electronic and ionic charge carriers, organic electrochemical transistors (OECTs) appeal as highly attractive candidates for a new generation of organic neuromorphic devices. Despite their acknowledged application potential, little is still known about the underlying physics and traditional transistor models fail to accurately describe the phenomena observed. This deficiency comes in part from the fact that such models are largely based on an electrostatic approach for metal-oxide-semiconductor field-effect transistors (MOSFETs), which is a very strong abstraction to the volumetric and complex processes in OECTs. On the other hand, material studies reveal the potential of an alternative approach, taking into account the electrochemical processes by means of thermodynamics and thus considering the OECTs intricacy. These two approaches oppose each other in explaining OECTs, neither of which can claim a comprehensive explanation of the transistor on its own so far. A unification of the two sides, on the other hand, could come much closer to a substantial explanation and provide a more accurate picture of reality. After giving a short overview of the most significant concepts of the two explanatory directions, a framework is presented that might come very close to this merger, as it accurately reproduces essential transfer properties of OECTs in terms of thermodynamics for the first time.
{"title":"On the modeling of organic electrochemical transistors","authors":"Lukas M. Bongartz, Matteo Cucchi, K. Leo, H. Kleemann","doi":"10.1117/12.2633291","DOIUrl":"https://doi.org/10.1117/12.2633291","url":null,"abstract":"Due to their synaptic functionality based on interacting electronic and ionic charge carriers, organic electrochemical transistors (OECTs) appeal as highly attractive candidates for a new generation of organic neuromorphic devices. Despite their acknowledged application potential, little is still known about the underlying physics and traditional transistor models fail to accurately describe the phenomena observed. This deficiency comes in part from the fact that such models are largely based on an electrostatic approach for metal-oxide-semiconductor field-effect transistors (MOSFETs), which is a very strong abstraction to the volumetric and complex processes in OECTs. On the other hand, material studies reveal the potential of an alternative approach, taking into account the electrochemical processes by means of thermodynamics and thus considering the OECTs intricacy. These two approaches oppose each other in explaining OECTs, neither of which can claim a comprehensive explanation of the transistor on its own so far. A unification of the two sides, on the other hand, could come much closer to a substantial explanation and provide a more accurate picture of reality. After giving a short overview of the most significant concepts of the two explanatory directions, a framework is presented that might come very close to this merger, as it accurately reproduces essential transfer properties of OECTs in terms of thermodynamics for the first time.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121044487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Influence of in-plane only retardation switching of an SSD (Smectic Single Domain) liquid crystal both on light diffraction efficiency and beam steering performance has been investigated. An SSD liquid crystal’s in-plane only retardation switching keeping its molecular director always perpendicular to the externally applied electric field is reasonably assumed to provide unique performance both on light diffraction and beam steering. The in-plane only retardation switching was confirmed with polarimetry and light throughput dynamic profiles both for linearly and circularly polarized incident beams. Using the SSD liquid crystal, < 1 ms response with up to 6 degrees steering has been confirmed.
{"title":"Influence of some smectic liquid crystals’ retardation switching behavior on beam steering performance","authors":"A. Mochizuki","doi":"10.1117/12.2632870","DOIUrl":"https://doi.org/10.1117/12.2632870","url":null,"abstract":"Influence of in-plane only retardation switching of an SSD (Smectic Single Domain) liquid crystal both on light diffraction efficiency and beam steering performance has been investigated. An SSD liquid crystal’s in-plane only retardation switching keeping its molecular director always perpendicular to the externally applied electric field is reasonably assumed to provide unique performance both on light diffraction and beam steering. The in-plane only retardation switching was confirmed with polarimetry and light throughput dynamic profiles both for linearly and circularly polarized incident beams. Using the SSD liquid crystal, < 1 ms response with up to 6 degrees steering has been confirmed.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132968873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Preferential alignment of molecular permanent dipole moments, known as spontaneous orientation polarization (SOP), is present in many materials employed in the active layers of organic light-emitting devices (OLEDs). This phenomenon leads to the formation of bound polarization charge, which is compensated by polaron accumulation at voltages below turn-on. While most prior work has focused on polarization in the device electron transport layer (ETL), here we examine the impact of emissive layer SOP by systematically probing polaron accumulation and exciton-polaron quenching in phosphorescent OLEDs. To gain a deeper understanding of polaron accumulation, device capacitance is systematically probed as a function of voltage across samples with polar and nonpolar emissive layers. We find that capacitance measurements can be used to track not only the number of accumulated charges, but also its location within the device active layers. This study provides an analysis framework that allows further insights on the charge accumulation process in OLEDs, thus improving our understanding of SOP in OLEDs
{"title":"The role of OLED emissive layer polarization in sub-turn-on charge accumulation","authors":"E. Pakhomenko, R. Holmes","doi":"10.1117/12.2633591","DOIUrl":"https://doi.org/10.1117/12.2633591","url":null,"abstract":"Preferential alignment of molecular permanent dipole moments, known as spontaneous orientation polarization (SOP), is present in many materials employed in the active layers of organic light-emitting devices (OLEDs). This phenomenon leads to the formation of bound polarization charge, which is compensated by polaron accumulation at voltages below turn-on. While most prior work has focused on polarization in the device electron transport layer (ETL), here we examine the impact of emissive layer SOP by systematically probing polaron accumulation and exciton-polaron quenching in phosphorescent OLEDs. To gain a deeper understanding of polaron accumulation, device capacitance is systematically probed as a function of voltage across samples with polar and nonpolar emissive layers. We find that capacitance measurements can be used to track not only the number of accumulated charges, but also its location within the device active layers. This study provides an analysis framework that allows further insights on the charge accumulation process in OLEDs, thus improving our understanding of SOP in OLEDs","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114437684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Shahini, Michel Meylender, Tom Menei, S. Campidelli, G. Scalia
Graphene oxide liquid crystal has very interesting optical and electro-optic properties. In fact, reorientation occurs already at few volts per millimeter and the disk-like graphene oxide flakes, typically suspended in water, can form liquid crystal phases at very low concentration due to the large aspect ratio of the flakes. The liquid crystal formation depends on the flake size, their concentration but also on the magnitude of the repulsive and attractive inter-flakes forces. However, the spatial confinement has relevance too on the macroscopic alignment and even in inducing birefringence as visible in filaments and in more confining configurations. Unlike graphene, graphene oxide has a very small light absorption in the visible, in some regions actually negligible. However, even if the colloidal characteristics are preserved and there is still birefringence, the optical characteristic can change due to near-UV exposure, resulting in an increase of optical absorption. This has the consequence that the imaginary part has to be included in the general refractive index expression and in the optical transmission evaluation. Stability is an important aspect for graphene oxide suspensions either for changes in the optical characteristics or the destabilization of the suspension due to partial or total reduction leading to the formation of reduced graphene oxide, but also for the isotropic – nematic phase separation occurring for concentrations in the bi-phase region. All these aspects are very relevant also for electro-optic applications. It will be shown here that some issues can be solved and improved if the chosen phase is the nematic phase.
{"title":"Stable colloidal suspension of graphene oxide liquid crystals: optical characteristics and electro-optic switching for sample","authors":"S. Shahini, Michel Meylender, Tom Menei, S. Campidelli, G. Scalia","doi":"10.1117/12.2646205","DOIUrl":"https://doi.org/10.1117/12.2646205","url":null,"abstract":"Graphene oxide liquid crystal has very interesting optical and electro-optic properties. In fact, reorientation occurs already at few volts per millimeter and the disk-like graphene oxide flakes, typically suspended in water, can form liquid crystal phases at very low concentration due to the large aspect ratio of the flakes. The liquid crystal formation depends on the flake size, their concentration but also on the magnitude of the repulsive and attractive inter-flakes forces. However, the spatial confinement has relevance too on the macroscopic alignment and even in inducing birefringence as visible in filaments and in more confining configurations. Unlike graphene, graphene oxide has a very small light absorption in the visible, in some regions actually negligible. However, even if the colloidal characteristics are preserved and there is still birefringence, the optical characteristic can change due to near-UV exposure, resulting in an increase of optical absorption. This has the consequence that the imaginary part has to be included in the general refractive index expression and in the optical transmission evaluation. Stability is an important aspect for graphene oxide suspensions either for changes in the optical characteristics or the destabilization of the suspension due to partial or total reduction leading to the formation of reduced graphene oxide, but also for the isotropic – nematic phase separation occurring for concentrations in the bi-phase region. All these aspects are very relevant also for electro-optic applications. It will be shown here that some issues can be solved and improved if the chosen phase is the nematic phase.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"819 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126817821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hyukmin Kwon, Seokwoo Kang, Sunwoo Park, Seyoung Oh, Jongwook Park
Perovskites is a very promising material that is being extensively studied at the bulk and nanosize scales because it has outstanding optical properties, including high quantum efficiency and narrow emission spectra. To realize a full-color display in the research field of perovskites or perovskite-structured quantum dots (PeQDs), the development of white-light-emitting devices that operate by emitting light of three primary colors (red, green, and blue) has emerged as an active research topic. In this presentation, we report for the first time three-color white-light emission with high brightness from white-emitting PeQD organic light-emitting diodes (WPeQD-OLEDs) fabricated using a PeQD material and organic emitters. The electroluminescence (EL) spectra of the WPeQD-OLEDs showed EL maximum peaks at 460, 527, and 640 nm; the CIE color coordinates of the emitted light were (0.33, 0.40). The EL results confirmed that the maximum luminance was 49,000 cd m−2 and the maximum luminance efficiency and power efficiency were 4.48 cd A−1 and 2.16 lm W−1 . Also, we achieved a new hybrid pink device of perovskite red QD (PRQD) and organic blue emitter (OBE) which have different emission mechanisms in bilayered LED devices. It has pink emission, CIE coordinate of (0.331, 0.204) which cannot be provided by a single emitter.
钙钛矿是一种非常有前途的材料，由于其具有优异的光学特性，包括高量子效率和窄发射光谱，因此在体和纳米尺度上得到了广泛的研究。为了实现钙钛矿或钙钛矿结构量子点(PeQDs)研究领域的全彩色显示，开发利用三原色(红、绿、蓝)发光的白光发光器件已成为一个活跃的研究课题。在本报告中，我们首次报道了使用PeQD材料和有机发光体制造的白光PeQD有机发光二极管(wpeqd - oled)具有高亮度的三色白光发射。wpeqd - oled的电致发光(EL)光谱在460、527和640 nm处显示出最大的EL峰;发射光的CIE色坐标为(0.33,0.40)。EL结果证实，最大亮度为49,000 cd m−2，最大发光效率和功率效率分别为4.48 cd A−1和2.16 lm W−1。此外，我们还在双层LED器件中实现了具有不同发射机制的钙钛矿红色量子点(PRQD)和有机蓝色发射体(OBE)的新型混合粉红色器件。它具有粉红色的发射，CIE坐标为(0.331,0.204)，这是单个发射器无法提供的。
{"title":"Hybrid color conversion control using OLED and perovskite emitters","authors":"Hyukmin Kwon, Seokwoo Kang, Sunwoo Park, Seyoung Oh, Jongwook Park","doi":"10.1117/12.2632662","DOIUrl":"https://doi.org/10.1117/12.2632662","url":null,"abstract":"Perovskites is a very promising material that is being extensively studied at the bulk and nanosize scales because it has outstanding optical properties, including high quantum efficiency and narrow emission spectra. To realize a full-color display in the research field of perovskites or perovskite-structured quantum dots (PeQDs), the development of white-light-emitting devices that operate by emitting light of three primary colors (red, green, and blue) has emerged as an active research topic. In this presentation, we report for the first time three-color white-light emission with high brightness from white-emitting PeQD organic light-emitting diodes (WPeQD-OLEDs) fabricated using a PeQD material and organic emitters. The electroluminescence (EL) spectra of the WPeQD-OLEDs showed EL maximum peaks at 460, 527, and 640 nm; the CIE color coordinates of the emitted light were (0.33, 0.40). The EL results confirmed that the maximum luminance was 49,000 cd m−2 and the maximum luminance efficiency and power efficiency were 4.48 cd A−1 and 2.16 lm W−1 . Also, we achieved a new hybrid pink device of perovskite red QD (PRQD) and organic blue emitter (OBE) which have different emission mechanisms in bilayered LED devices. It has pink emission, CIE coordinate of (0.331, 0.204) which cannot be provided by a single emitter.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114205571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brandon Vreeland, A. V. Van Rynbach, D. Bryant, P. Bos
Two methods for designing a continuous optical beam steering device are to use a linear phase profile based on physical optical pathlength (OPL) , and based on Pancharatnam phase (PP) . There are challenges with both of these basic approaches when considering design goals of high steering angle range, resolution, speed, and efficiency. In this overview talk, a comparison will be made between these two approaches with regard to these design goals. The limiting effects on each of these design goals will be considered with detailed FDTD optical modeling, and compared with experimental measurements.
{"title":"Performance comparison of continuous optical beam steering approaches","authors":"Brandon Vreeland, A. V. Van Rynbach, D. Bryant, P. Bos","doi":"10.1117/12.2633673","DOIUrl":"https://doi.org/10.1117/12.2633673","url":null,"abstract":"Two methods for designing a continuous optical beam steering device are to use a linear phase profile based on physical optical pathlength (OPL) , and based on Pancharatnam phase (PP) . There are challenges with both of these basic approaches when considering design goals of high steering angle range, resolution, speed, and efficiency. In this overview talk, a comparison will be made between these two approaches with regard to these design goals. The limiting effects on each of these design goals will be considered with detailed FDTD optical modeling, and compared with experimental measurements.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127275843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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