Journal of Luminescence最新文献_第5页

Revealing defects in Cu2O microstructures: Temperature-dependent photoluminescence insights from pH-tuned facet engineering Cu2O 揭示Cu2O微结构中的缺陷：来自ph调谐面工程Cu2O的温度依赖性光致发光见解

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-07 DOI: 10.1016/j.jlumin.2026.121751

Mahmoud A. Khalifa , Mahmoud Abdelfatah , Mohamed A. Habib , Abdelhamid El-Shaer

Temperature-dependent photoluminescence (TDPL) provides powerful insight into the optical features of semiconductors. In this work, we investigate the impact of solution pH (9–13) on structural, morphological, and photoluminescence (PL) properties of Cu₂O micrograins, with a particular focus on how these PL changes are obvious at low temperatures (14 K–290 K). X-ray diffraction and scanning electron microscopy results reveal a pH-induced transition in preferred orientation from (200) to (111) facets, accompanied with morphological evolution from small to large micrograins. TDPL measurements uncover distinct recombination mechanisms; besides the near-band excitonic transitions of Cu₂O, two strong emission bands related to relaxed excitons at oxygen and copper vacancies are noticed. At 14 K, the pH 9 sample displays a broad PL emission centered at 748 nm, attributed to oxygen vacancies. In contrast, the pH 13 sample displays two distinct peaks at 680 nm and 849 nm, corresponding to oxygen and copper vacancies, respectively. These defect-related emissions are absent in the room-temperature PL spectra. Furthermore, the activation energies (E_a) of these vacancies, determined using the Arrhenius model, are 29.9 meV for oxygen vacancies in the pH 9 sample, and 19.2 meV (oxygen vacancies) and 39.4 meV (copper vacancies) for the pH 13 sample. These results of correlation thermal PL behavior with structural modulation highlight an effective strategy for tuning the defects in Cu₂O and underscore the value of TDPL in resolving emission pathways relevant to tunable optoelectronic applications.

温度依赖性光致发光（TDPL）提供了对半导体光学特性的强大洞察。在这项工作中，我们研究了溶液pH（9-13）对Cu2O微颗粒结构、形态和光致发光（PL）性质的影响，特别关注了这些PL变化在低温（14 K - 290 K）下是如何明显的。x射线衍射和扫描电镜结果显示，ph诱导的择优取向从（200）到（111）面的转变，伴随着微观晶粒从小到大的形态演变。TDPL测量揭示了不同的重组机制；除了Cu2O的近带激子跃迁外，还发现了与氧和铜空位弛豫激子有关的两个强发射带。在14k时，pH为9的样品显示出以748nm为中心的宽PL发射，这是由于氧空位造成的。相比之下，pH 13样品在680 nm和849 nm处有两个明显的峰，分别对应于氧和铜的空位。这些缺陷相关的发射在室温PL光谱中不存在。此外，利用Arrhenius模型测定了这些空位的活化能（Ea）， pH为9的氧空位为29.9 meV， pH为13的氧空位为19.2 meV，铜空位为39.4 meV。这些与结构调制相关的热PL行为的结果突出了调整Cu2O缺陷的有效策略，并强调了TDPL在解决与可调谐光电应用相关的发射路径方面的价值。

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引用次数: 0

Temperature dependence of Quasi-white-light emission in one-dimensional hybrid material (C12H18N)PbBr3 一维杂化材料（C12H18N）PbBr3准白光发射的温度依赖性

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-05 DOI: 10.1016/j.jlumin.2026.121748

Yassmin Kessentini , Iskandar Chaabane , Kawthar Abid , Ali Ben Ahmed , Habib Feki

Organic-inorganic hybrid materials have the potential of providing excellent properties and promising novel optical properties. This work focuses on the white light emission process of one-dimensional (1D) organic-inorganic perovskite (C₁₂H₁₈N)PbBr₃ abbreviated as 4BPP[PbBr₃]. Contrary to most organic-inorganic hybrid material, where the organic moieties act as barriers and the inorganic part play the role of quantum well, both organic and inorganic parts in 4BPP[PbBr₃] are optically active, giving rise to a strong and large emission band covering a wide range of the visible spectrum that can be seen even with the naked eye at room temperature. The photoluminescence spectrum is composed of three bands located at 490 nm (P1), 550 nm (P2) and 600 nm (P3). The first and the second bands are attributed respectivelyto

π - π^{*}

and intra-molecular charge transfer transition within the 4BPP organic cation whereas the third band is related to the inorganic Wannier exciton confined in lead bromide PbBr₃ chains. This result was supported by density functional theory calculation. Moreover, the temperature dependence of the PL emission for each transition reveals a different behaviour. In fact, a negative thermal quenching (NTQ) is observed for P1 evolution at low temperature. This NTQ emission is interpreted in terms of transitions between excitonic states involving an exciton-phonon interaction. The P2 observed emission behavior is explained by a charge carrier transfer mechanism between two quantum dots population and the P3 temperature quenching was explained by an increased level of non radiative recombination caused by the phonon vibration (80 cm⁻¹) which corresponds well to Pb-Br stretching vibration observed in Raman spectra.

有机-无机杂化材料具有优异的性能和前景广阔的新型光学性能。本文主要研究一维（1D）有机-无机钙钛矿（C12H18N）PbBr3（简称4BPP[PbBr3]）的白光发射过程。与大多数有机-无机杂化材料相反，其中有机部分充当屏障，无机部分发挥量子阱的作用，4BPP[PbBr3]中的有机和无机部分都具有光学活性，产生强大而大的发射带，覆盖了宽广的可见光谱范围，即使在室温下也可以用肉眼看到。光致发光光谱由位于490 nm （P1）、550 nm （P2）和600 nm （P3）的三个波段组成。第一能带和第二能带分别归因于π−π *和4BPP有机阳离子内的分子内电荷转移跃迁，而第三能带与局限在溴化铅PbBr3链中的无机万尼尔激子有关。该结果得到了密度泛函理论计算的支持。此外，每个跃迁的PL发射的温度依赖性揭示了不同的行为。事实上，在低温下P1的演化存在负热猝灭（NTQ）。这种NTQ发射被解释为涉及激子-声子相互作用的激子态之间的跃迁。P2的发射行为可以用两个量子点之间的电荷载流子转移机制来解释，P3的温度猝灭可以用声子振动（80 cm−1）引起的非辐射复合水平的增加来解释，这与拉曼光谱中观察到的Pb-Br拉伸振动很好地对应。

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引用次数: 0

Phonon-assisted energy relaxation between laser levels of Bi active center associated with Si atom 与硅原子相关的双活性中心激光能级间声子辅助能量弛豫

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-05 DOI: 10.1016/j.jlumin.2026.121744

A.V. Elopov , K.E. Riumkin , D.S. Serenkov , M.V. Yashkov , A.N. Abramov , A.S. Lobanov , D.F. Burmistrov , S.V. Firstov , M.A. Melkumov

Multi-phonon-assisted energy relaxation is demonstrated as an effect improving properties of laser media. For the first time, luminescence properties enhancement of germanosilicate bismuth-doped optical active fiber with boron is suggested. Lifetime of luminescence, quantum yield and branching ratio of bismuth active center associated with Si atom (BAC-Si) in Bi-doped germanosilicate fibers were investigated from perspective of their perfection by addition of different boron molar fraction in a fiber core. The most appropriate molar fraction of boron content for optimization of laser characteristics of a germanosilicate bismuth-doped active fiber was evaluated. Einstein coefficients and multi-phonon decay rates of electron transitions in BAC-Si were derived for co-doped with various concentration of boron and bismuth germanosilicate fibers.

证明了多声子辅助能量弛豫对激光介质性能的改善作用。首次提出用硼增强锗硅铋掺杂光活性光纤的发光性能。通过在纤维芯中加入不同硼摩尔分数，研究了双掺杂锗硅纤维中硅原子相关的铋活性中心（BAC-Si）的发光寿命、量子产率和支化比。评价了硼的摩尔分数对锗硅铋掺杂活性光纤激光特性的影响。在不同浓度的硼和锗硅铋纤维共掺杂下，得到了BAC-Si中电子跃迁的爱因斯坦系数和多声子衰减率。

引用次数: 0

Restriction of photoinduced proton transfer by complexation in dual channel ESIPT active molecule: Fluorimetric Al3+ sensor and live cell imaging 双通道ESIPT活性分子络合对光诱导质子转移的限制：荧光Al3+传感器和活细胞成像

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-05 DOI: 10.1016/j.jlumin.2026.121749

Shuba Paul , Riya Ghanti , Arnab Chakrabarty , Chandan Das , Siddik Sarkar , Sanchita Goswami

The Schiff base probe, 2-Benzothiazol-2-yl-6-[(1-benzyl-piperidin-4-ylimino)-methyl]-4-methylphenol (HBTAP) was constructed by reacting 3-benzothiazolyl-5- methylsalicylaldehyde and 4-amino-1-benzylpiperidine in methanol medium. The resultant probe is characterized by various spectroscopic techniques such as ¹H & ¹³C NMR, ESI-MS, IR and SC-XRD. The fluorescence intensity of the HBTAP solution increases significantly in the presence of only aluminium ion at λ_max = 545 nm among other metal ions. Jobs plot and ESI-MS spectrum support a 2:1 binding ratio with Al³⁺ in ACN-HEPES (8:2, v/v pH = 7.2). The value of limit of detection and binding constant for Al³⁺ with HBTAP were found to be 66 nM and 8.82 × 10³ M⁻² respectively. The pronounced increase of yellowish green fluorescence can be referred to as Chelation-enhanced fluorescence (CHEF), established by fluorescence time resolved measurement. Solid state fluorescence study reveals that ESIPT occurs at imine nitrogen side of 4-amino-1-benzylpiperidine part. Ground state optimization and energy calculation of HOMO-LUMO is done by DFT study to confirm the binding mechanism. Additionally, HBTAP can be used successfully to monitor the sensing ability of the probe HBTAP towards Al³⁺ in MDAMB-231 human cancer cell line.

以3-苯并噻唑-5-甲基水杨醛和4-氨基-1-苄基哌啶为原料，在甲醇介质中合成了希夫碱探针2-苯并噻唑-2-酰基-6-[（1-苄基-哌啶-4-酰基）-甲基]-4-甲基苯酚（HBTAP）。所得探针通过1H &； 13C NMR, ESI-MS， IR和SC-XRD等多种光谱技术进行了表征。在λmax = 545 nm处，在其他金属离子中，只有铝离子存在时，HBTAP溶液的荧光强度显著增加。Jobs图和ESI-MS谱支持ACN-HEPES与Al3+的结合比为2:1 （8:2,v/v pH = 7.2）。HBTAP对Al3+的检出限为66 nM，结合常数为8.82 × 103 M−2。黄绿色荧光的明显增强称为螯合增强荧光（Chelation-enhanced fluorescence， CHEF），通过荧光时间分辨测定建立。固体荧光研究表明，ESIPT发生在4-氨基-1-苄基哌啶部分的亚胺氮侧。通过DFT研究对HOMO-LUMO进行基态优化和能量计算，确定其结合机理。此外，HBTAP可以成功地用于监测探针HBTAP对MDAMB-231人癌细胞系中Al3+的传感能力。

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引用次数: 0

Twist-controlled electronic conjugation in pyrazoloquinoline dyes: Photostable blue emitters with near-unity fluorescence quantum yields 吡唑喹啉染料中的扭控电子偶联：具有接近统一荧光量子产率的光稳定蓝色发射体

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-05 DOI: 10.1016/j.jlumin.2026.121747

Tomasz Uchacz , Paweł Szlachcic , Marcin Andrzejak , Joanna Zams , Piotr Wieczorek , Przemysław Kolek , Katarzyna Stadnicka , Andrzej Danel , Arkadiusz Gut

The design of highly fluorescent chromophores has gained notable interest in recent years. In this work, we synthesized two new dyes based on the 1H-pyrazolo[3,4-b]quinoline scaffold, each bearing a sterically twisted phenyl group at the 1-position of the pyrazole ring. By varying the number of methyl substituents on the phenyl ring (1-(2-methylphenyl) and 1-(2,6-dimethylphenyl)), we were able to tune the torsional angle between the phenyl group and the heterocyclic core. This structural control enabled modulation of key photophysical properties, including fluorescence quantum yield, fluorescence lifetime, emission color, and solvatochromism. The reference compound lacking steric hindrance (1-phenyl-pyrazoloquinoline) displayed polarity-dependent blue-green fluorescence, long fluorescence lifetimes (up to 31 ns), and a large excited-state dipole moment (11.4 D). Increasing steric congestion forced the phenyl ring toward a nearly perpendicular orientation (DFT-predicted torsion ∼80°), reducing electronic coupling with the pyrazole core. This electronic decoupling resulted in highly efficient fluorescence, with quantum yields reaching 100 % and lifetimes of ∼14 ns. Consequently, the emission in polar solvents could be systematically tuned from blue-green to deep blue depending on the number of methyl substituents. The dyes exhibited excellent photostability, with only 1.5 % degradation after 6 h of irradiation at 350 nm, as well as high thermal stability and no tendency to aggregate. Furthermore, the investigated compounds maintained near-unity fluorescence quantum yields even when incorporated into a polymer matrix. These features suggest strong potential for optical applications, particularly as fluorescence quantum yield standards. The experimental observations were supported by quantum-chemical calculations, X-ray crystallography, and cyclic voltammetry measurements.

近年来，高荧光发色团的设计引起了人们的极大兴趣。在这项工作中，我们基于1h -吡唑啉[3,4-b]喹啉支架合成了两种新的染料，每种染料在吡唑环的1位上都有一个立体扭曲的苯基。通过改变苯基环上的甲基取代基（1-（2-甲基苯基）和1-（2,6-二甲基苯基））的数量，我们能够调整苯基和杂环核心之间的扭角。这种结构控制可以调节关键的光物理性质，包括荧光量子产率、荧光寿命、发射颜色和溶剂变色。缺乏位阻的参比化合物（1-苯基吡唑喹啉）显示出极性依赖的蓝绿色荧光，荧光寿命长（高达31 ns），激发态偶极矩大（11.4 D）。空间拥塞的增加迫使苯基环朝向几乎垂直的方向（dft预测的扭转~ 80°），减少了与吡唑核心的电子耦合。这种电子去耦导致了高效荧光，量子产率达到100%，寿命为~ 14 ns。因此，极性溶剂中的发射可以根据甲基取代基的数量系统地从蓝绿色调谐到深蓝色。该染料表现出优异的光稳定性，在350 nm照射6 h后降解率仅为1.5%，具有较高的热稳定性和无聚集倾向。此外，所研究的化合物保持接近统一的荧光量子产率，即使合并到聚合物基质中。这些特征表明光学应用的巨大潜力，特别是作为荧光量子产率标准。实验观察得到了量子化学计算、x射线晶体学和循环伏安法测量的支持。

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引用次数: 0

Highly twisted dual state emissive imidazole donor-acceptor fluorophore: Reversible halofluorochromism and structure controlled photostability 高度扭曲双态发射咪唑给受体荧光团：可逆的氟化荧光和结构控制的光稳定性

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-04 DOI: 10.1016/j.jlumin.2026.121746

R. Rameshbabu Priyadharsan , Sasikala Ravi , Elakkiya Sivakumar , Subramanian Karthikeyan , Mehboobali Pannipara , Abdullah G. Al-Sehemi , Dohyun Moon , Savarimuthu Philip Anthony

Dual state emissive imidazole derivatives, 4-(4,5-diphenyl-1H-imidazole-2-yl)-3,5-dimethoxy-N,N-diphenylaniline (Imi-B) and 3,5-dimethoxy-4-(1H-phenanthro[9,10-d]imidazole-2-yl)-N,N-diphenylaniline (Imi-P) were synthesized and investigated their photophysical and stimuli-responsive properties in solution as well as solid-state. Single crystal structural studies revealed highly twisted molecular conformation between triphenylamine phenyl and imidazole due to the presence of methoxy substituents. Imi-B and Imi-P showed strong solid-state fluorescence (quantum yield (ϕ_f) = 22.03 and 12.4 %) at 435 and 456 nm, respectively. Both Imi-B and Imi-P also displayed strong fluorescence in solvents with different polarity (ϕ_f = 0.07 to 0.53 compared to quinine sulphate standard). The presence of acid-responsive nitrogen functionality was utilized to demonstrate pH dependent reversible fluorescence switching in solution as well as solid-state. In solids, Imi-B showed red shifting of fluorescence with strong reduction of intensity whereas Imi-P displayed only red shifting of emission upon trifluoroacetic acid (TFA) exposure. In contrast, both molecules showed significant reduction of intensity with red shifting of emission in solution by TFA exposure. The fluorescence was perfectly reversed to initial state by NH₃ exposure in solution compared to the solid-state. The photostability studies revealed strong reduction of fluorescence intensity and appearance of new absorption for Imi-B. But Imi-P displayed good stability and did not show significant change over 80 min UV exposure. Thus, the conformation of integrating phenyl substituents in the imidazole units significantly influenced on the photostability of imidazole derivatives.

合成了咪唑双态发射衍生物4-（4,5-二苯基- 1h -咪唑-2-基）-3,5-二甲氧基- n， n -二苯基苯胺（Imi-B）和3,5-二甲氧基-4-（1h -菲唑[9,10-d]咪唑-2-基）- n， n -二苯基苯胺（Imi-P），并研究了它们在溶液和固态中的光物理和刺激响应性能。单晶结构研究表明，由于甲氧基取代基的存在，三苯胺苯基和咪唑之间存在高度扭曲的分子构象。在435 nm和456nm处，Imi-B和Imi-P表现出较强的固态荧光（量子产率（ϕf）分别为22.03和12.4%）。Imi-B和Imi-P在不同极性的溶剂中也显示出很强的荧光（与硫酸奎宁标准相比，ϕ = 0.07 ~ 0.53）。利用酸响应氮功能的存在来证明溶液和固态中pH依赖的可逆荧光开关。在固体中，Imi-B在三氟乙酸（TFA）暴露下表现出荧光红移和强度的强烈降低，而Imi-P仅表现出发射红移。相比之下，这两种分子暴露在TFA溶液中都表现出明显的强度降低和发射红移。与固态相比，NH3暴露在溶液中的荧光完全逆转到初始状态。光稳定性研究表明，Imi-B的荧光强度明显降低，并出现新的吸收。但Imi-P表现出良好的稳定性，在紫外线照射80分钟后没有明显变化。因此，在咪唑基上整合苯基取代基的构象对咪唑衍生物的光稳定性有显著影响。

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引用次数: 0

Multimodal and color-tunable luminescence in CaZnOS:Eu3+,Pr3+ phosphors CaZnOS:Eu3+，Pr3+荧光粉的多模态和颜色可调发光

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-04 DOI: 10.1016/j.jlumin.2026.121745

Sarfraz Ahmad , Shulong Chang , Fuhang Jiao , Yuan Deng , Xiang Li , Junlu Sun , Ying Xiao , Lin Dong

With the growing demands for multilayered security and advanced anti-counterfeiting technologies, luminescent materials capable of multimodal excitation and color tuning are increasingly vital. Here, we report the solid-state synthesis of CaZnOS-based phosphors co-doped with Eu³⁺ and Pr³⁺, enabling excitation- and stress-dependent emission across a broad chromatic range. Systematic variation of Pr³⁺ concentration, with Eu³⁺ fixed at 1.5 %, revealed broad photoluminescence spanning red to bluish-green under UV excitation (290–490 nm) and mechanoluminescence with force-induced color evolution from red to green. Temperature-dependent PL further demonstrated clear thermochromic responses, particular in CaZnOS:1.5 %Eu³⁺,1 %Pr³⁺. Practical demonstrations in color-tunable handwriting and anticounterfeiting labels underscore the versatility of these phosphors in secure and interactive optical applications. The combination of remarkable color-tuning capability, robust mechanoluminescent performance, and thermal stability positions CaZnOS:Eu³⁺,Pr³⁺ as an ideal platform for next-generation e-signatures, security features, and integrated optoelectronic devices.

随着人们对多层安全性和先进防伪技术的需求日益增长，具有多模态激发和颜色调谐功能的发光材料变得越来越重要。在这里，我们报道了与Eu3+和Pr3+共掺杂的caznos基荧光粉的固态合成，使激发和应力依赖的发光在宽的色范围内。Pr3+浓度系统变化时，Eu3+固定在1.5%，在紫外激发下（290-490 nm）显示出从红色到蓝绿色的广泛光致发光，并在力诱导下从红色到绿色演变为机械发光。温度依赖性PL进一步表现出明显的热致变色反应，特别是在CaZnOS: 1.5% Eu3+， 1% Pr3+中。可调色手写和防伪标签的实际演示强调了这些荧光粉在安全和交互式光学应用中的多功能性。卓越的调色能力、强大的机械发光性能和热稳定性使CaZnOS:Eu3+、Pr3+成为下一代电子签名、安全功能和集成光电器件的理想平台。

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引用次数: 0

Electrostatic self-assembled rhodamine B functionalized terbium-based MOFs for highly sensitive detection of sulfide ions 静电自组装罗丹明B功能化铽基mof用于高灵敏度检测硫化物离子

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121736

Yuhong Xie , Yiying Wang , Yourong Zhao , Jiali Yang , Yangchun Fan , Hongda Li , Daojiang Gao , Zhanglei Ning

In this study, a dual-emission ratiometric fluorescent materials, rhodamine B-functionalized terbium-based metal-organic frameworks (RhB@Tb-MOFs), were synthesized through an ultrasonic immersion approach. The resulting RhB@Tb-MOFs demonstrate a distinct red-green dual emission, generating an easily distinguishable orange-red luminescence with excellent stability across a wide pH range and aqueous environments. This novel probe demonstrates excellent selectivity along with outstanding anti-interference capability, achieving a detection limit as low as 0.219 μM for S²⁻. Moreover, the sensing mechanism was studied in detail, which is attributed to a dynamic quenching mechanism. This study highlights a versatile and generalizable approach for enhancing luminescence-based sensing performance through the encapsulation of fluorescent dyes in Ln-MOFs, presenting significant potential for environmental monitoring and bioanalytical applications.

本研究采用超声浸没法合成了一种双发射比荧光材料罗丹明b功能化铽基金属有机骨架（RhB@Tb-MOFs）。由此产生的RhB@Tb-MOFs显示出明显的红绿双发射，产生易于区分的橙红色发光，在宽pH范围和水环境中具有优异的稳定性。该探针具有优异的选择性和抗干扰能力，对S2−的检测限低至0.219 μM。并对其传感机理进行了详细研究，认为其是一种动态猝灭机制。这项研究强调了一种通用的方法，通过在ln - mof中封装荧光染料来增强基于发光的传感性能，在环境监测和生物分析应用中具有重要的潜力。

引用次数: 0

Organic-inorganic hybrid perovskite as a self-sacrificing template towards high-quality Cs4PbBr6 green emitters 有机-无机杂化钙钛矿作为自我牺牲模板制备高质量的Cs4PbBr6绿色发光体

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121734

Siyuan Fu , Hong Ming , Haorui Zhu , Kaiyu Huang , Hanqi Yao , Zhen Chen , Xiaofeng Liu , Huidan Zeng

Driven by the urgent need for narrow-band green emitters to address the color gamut deficiency in current white light-emitting diodes (WLEDs), in this work we develop a novel precursor-mediated strategy for the controlled synthesis of high-efficiency Cs₄PbBr₆ perovskite crystals. Unlike conventional methods that often yield mixed phases, we utilize a judiciously designed organic-inorganic hybrid perovskite crystal, (HDA)Cs₂Pb₃Br₁₀ (HDA = 1,6-hexanediamine), as a self-sacrificing template for the synthsis of high purity Cs₄PbBr₆ crystals. By precisely adjusting the solvent composition (HBr/DMF(N,N-Dimethylformamide) ratio) during the dissolution-recrystallization process, selective and controllable phase conversion of the hybrid perovskite to Cs₄PbBr₆ or CsPbBr₃ was achieved. Specifically, the resulting high-quality Cs₄PbBr₆ crystals exhibit a high photoluminescence quantum yield (PLQY) of up to 94 %. The phase transition mechanism systematically investigated through combined spectroscopic methods unravels that the transformation into all-inorganic perovskites benefits from the stripping of the HDA²⁺ organic interlayer by the DMF solvent, while the formation of high-quality Cs₄PbBr₆ crystals is attributed to the Pb-deficient environment provided by HBr and DMABr (Dimethylammonium bromide). Furthermore, a prototype WLED device fabricated with the obtained Cs₄PbBr₆ crystals and commercial K₂SiF₆:Mn⁴⁺ phosphor demonstrated a high luminous efficiency of 98.04 lm/W and an extensive color gamut covering 136 % of National Television System Committee (NTSC) and 101.6 % of Rec.2020 (derived from the photoluminescence spectra after passing RGB optical filters). These results highlight the potential of the Cs₄PbBr₆ crystals for application in advanced wide-color-gamut displays.

为解决当前白光二极管（wled）色域不足的迫切需要，我们开发了一种新的前驱体介导策略，用于控制合成高效的Cs4PbBr6钙钛矿晶体。不同于传统的方法通常会产生混合相，我们利用一种精心设计的有机-无机杂化钙钛矿晶体（HDA）Cs2Pb3Br10 （HDA = 1,6-己二胺）作为自我牺牲模板来合成高纯度的Cs4PbBr6晶体。通过在溶解-重结晶过程中精确调节溶剂组成（HBr/DMF（N，N-二甲基甲酰胺）比），实现了杂化钙钛矿向Cs4PbBr6或CsPbBr3的选择性可控相变。具体来说，得到的高质量Cs4PbBr6晶体具有高达94%的光致发光量子产率（PLQY）。通过组合光谱方法系统研究了钙钛矿的相变机理，揭示了钙钛矿向全无机钙钛矿的转变得益于DMF溶剂对HDA2+有机中间层的剥离，而高质量Cs4PbBr6晶体的形成归因于HBr和DMABr（二甲基溴化铵）提供的缺铅环境。此外，用获得的Cs4PbBr6晶体和商用K2SiF6:Mn4+荧光粉制作的WLED原型器件显示出98.04 lm/W的高发光效率和广泛的色域，覆盖了国家电视系统委员会（NTSC）的136%和Rec.2020的101.6%（通过RGB滤光片后的光致发光光谱）。这些结果突出了Cs4PbBr6晶体在先进的宽色域显示器中的应用潜力。

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引用次数: 0

Photo- and X-ray excited luminescence, thermoluminescence and scintillation characteristics of LuGd2Al3Ga2O12:Ce,Mo single crystal scintillators: Influence of Mo co-doping LuGd2Al3Ga2O12:Ce，Mo单晶闪烁体的光激发发光、热发光和闪烁特性：Mo共掺杂的影响

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121737

Warut Chewpraditkul , Nakarin Pattanaboonmee , Weerapong Chewpraditkul , Ongsa Sakthong , Masao Yoshino , Takahiko Horiai , Shunsuke Kurosawa , Kei Kamada , Romana Kucerkova , Alena Beitlerova , Tingsong Li , Yanbin Wang , Chen Hu , Jiang Li , Vlademir Babin , Martin Nikl , Akira Yoshikawa

Mo co-doped LuGd₂Al₃Ga₂O₁₂:Ce,Mo (Mo = 0, 300, 600 ppm) single crystals were grown by the micro-pulling-down method. The optical absorption and X-ray excited luminescence spectra, temperature dependence of photoluminescence decay kinetics, afterglow and thermoluminescence (TL) intensity, and scintillation properties (light yield, LY, and decay time) were investigated. The quenching temperature of 355 K was determined from temperature-dependent photoluminescence decay kinetics in the temperature range of 77–487 K under excitation in the 4f - 5d₁ absorption band of the Ce³⁺ ions. Under excitation of 662 keV γ rays, the LuGd₂Al₃Ga₂O₁₂:Ce,Mo600 sample showed high LY value of 32,900 photons/MeV, energy resolution of 7.6 %, and scintillation decay time of 119 ns (38 %) + 475 ns (62 %). The lower LY value together with higher contribution of slower scintillation decay component among the samples studied was observed for LuGd₂Al₃Ga₂O₁₂:Ce,Mo300 sample, consistently with its higher afterglow intensity and longer de-trapping time of the dominant TL glow peak at 356 K.

采用微拉下法制备了Mo共掺杂LuGd2Al3Ga2O12:Ce，Mo （Mo = 0,300, 600 ppm）单晶。研究了光吸收和x射线激发发光光谱、光致发光衰变动力学、余辉和热致发光（TL）强度以及闪烁特性（产光量、LY和衰变时间）的温度依赖性。在Ce3+离子的4f - 5d1吸收带激发下，在77 ~ 487 K的温度范围内，根据温度依赖的光致发光衰变动力学确定了355 K的猝灭温度。在662 keV γ射线激发下，LuGd2Al3Ga2O12:Ce，Mo600样品的LY值高达32900光子/MeV，能量分辨率为7.6%，闪烁衰减时间为119 ns (38%) + 475 ns（62%）。LuGd2Al3Ga2O12:Ce，Mo300样品具有较低的LY值和较慢的闪烁衰减分量的较高贡献，且在356k时具有较高的余辉强度和较长的脱捕获时间。

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引用次数: 0