CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Hao Yao,Xinhua Ouyang
Quasi-2D perovskite materials hold great promise for efficient blue LEDs due to their unique multi-quantum-well structure. However, achieving high efficiency in blue quasi-2D perovskite LEDs (PeLEDs) remains challenging, largely because of uncontrolled phase distribution and defect-related non-radiative recombination. In this work, two isomeric forms of diammonium organic cations were designed and synthesized, 1,4-phenylenedimethan-aminium bibromide (m-PDMABr₂) and 1,3-phenylene-dimethanaminium bibromide (p-PDMABr₂), which introduces them as blended spacer cations together with phenethylammonium bromide (PEABr). These isomers not only suppress the formation of undesired small-n phases but also passivate defects in the perovskite film. By optimizing the blending ratio of m-PDMABr₂ to PEABr (3:7), we achieve improved phase distribution and lower defect density. As a result, the champion PeLED delivers a peak external quantum efficiency (EQE) of 13.68%. While devices using p-PDMABr₂ at the same ratio reach a maximum EQE of 12.26%. Compared to the control device based solely on PEABr (EQE = 7.11%), these represent remarkable improvements of 92.41% and 72.43%, respectively. Our study demonstrates that strategically designed isomeric spacer cations can effectively tune phase behavior and suppress defects, offering a practical materials-design strategy for high-performance blue quasi-2D PeLEDs.
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高影响因子
Nanoscale
·
2019
·Vol. 11
·期 36
·16907-16918
·
IF 6.97
Hong Lin,Jian Mao,Minchao Qin,Zhilong Song,Wanjian Yin,Xinhui Lu,Wallace C. H. Choy
While red is one of the primary colors for display applications, the investigation of visible red emitting perovskites, particularly 2D perovskites, is relatively limited. In this work, we demonstrate a single-phase Ruddlesden–Popper quasi-2D (C3H7NH3)2CsPb2I7 perovskite for red color LEDs. Through increasing the annealing temperature of (C3H7NH3)2CsPb2I7 perovskite thin films, we have successfully achieved tunable emission wavelengths from 654 to 691 nm. Equally important, for all the quasi-2D perovskite LEDs, once the annealing temperature is fixed, the emission spectrum is independent of bias voltages, which is very important for their use in lighting and displays. With the analysis of the crystallinity, morphology, and thermodynamic stability of the quasi-2D perovskite, we find that the obtained (C3H7NH3)2CsPb2I7 perovskite is a single-phase quasi-2D perovskite with only n = 2 phase. Besides, we found that the red shifting of emission wavelength is caused by the increase of perovskite crystal size while increasing the annealing temperature. Our results also show that the temperature-induced color tunability can be applied to a series of quasi-2D perovskites with different alkylammonium cations. Importantly, we find that short alkylammonium spacers offer better electrical properties for efficient current transport and high performance in LED applications. This work contributes to controlling the optoelectronic properties of quasi-2D perovskites via controlling their crystal growth as well as paves the way to realize practical lighting and display applications of perovskite LEDs.
研究领域:
材料科学
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光电功能材料
·
半导体器件
·
纳米结构材料
·
固态照明
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yu Zhang,Xuejie Zhang,Haoran Zhang,Zhan-Chao Wu,Yingliang Liu,Li Ma,Xiaojun Wang,Wei-Ren Liu,Bingfu Lei
A series green emission phosphors Sr 3 Lu 2 (BO 3 ) 4 :Ce 3+ ,Tb 3+ (denoted as SLBO:Ce 3+ ,Tb 3+ ) with broad absorption band matching well with UV LED chip were synthesized by the solid–state reaction method. The phase and structure were analyzed with XRD , EDX , FT-IR measurements. The energy transfer between Ce 3+ and Tb 3+ in SLBO was proved by spectra and decay curves detailedly. The emission colors vary from blue to green by adjusting the ratio of Ce 3+ /Tb 3+ doped concentration. With temperature increasing, SLBO:Ce 3+ ,Tb 3+ phosphor shows well thermal stability that emission intensity retains 70% of its initial at 25 °C even temperature rising to 150 °C. The internal and external quantum efficiency of SLBO:3%Ce 3+ ,8%Tb 3+ are 77.5% and 34.8% under 340 nm excitation, respectively. Combining the as-synthesized SLBO:Ce 3+ ,Tb 3+ and red emission phosphor CaAlSiN 3 :Eu 2+ coated on a 365 nm UV chip, a warm white LEDs device with CRI of 83 was achieved. All the results indicate that the SLBO:Ce 3+ ,Tb 3+ phosphor has potential application in UV pumped white LEDs.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态照明
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 46
·16584-16592
·
IF 7.059
Sheng Wu,Puxian Xiong,Xiaoqi Liu,Yubin Fu,Quan Liu,Mingying Peng,Yan Chen,Zhijun Ma
A blue emitting phosphor Na2Y2B2O7:Bi3+ was synthesized by a solid state reaction method. The structure characteristics, concentration, temperature-dependent luminescence and light emitting diode (LED) device performance were systematically studied. Adjustable photoluminescence (PL) from blue to green under different excitation wavelengths from 320 to 390 nm was observed, which is attributed to the complex energy transfer between multiple Bi3+ centres. Moreover, strong absorption in the near ultraviolet region (350–400 nm) was observed in Na2Y2B2O7:Bi3+, which is desirable for LEDs excited by near ultraviolet chips. In addition, a thermal quenching experiment was carried out and the calculated activation energy was 0.28 eV, indicating that this new Na2Y2B2O7:Bi3+ phosphor has good thermal stability. Finally, we explored the application of the Na2Y2B2O7:Bi3+ phosphor by encapsulating LED devices. The device Commission of Illumination (CIE) coordinates are (0.3572, 0.3407), and a high color rendering index (CRI) of 91.1 and a low corresponding color temperature (CCT) of 4480 K under 60 mA current were recorded. These characteristics show that this phosphor can be used to prepare white LED devices excited by near ultraviolet chips.
研究领域:
材料科学
·
光电子学
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固态照明
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发光材料
·
磷光体化学
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 11
·3865-3874
·
IF 6.4
Sheng Wu,Shanshan Hu,Quan Liu,Shuai Zhang,Dongliang Jiang,Guoxing Zhang,Yakun Le,Yao Xiao,Binli Xiao,Puxian Xiong,Yan Chen,Yinzhen Wang
Luminous properties play an essential role in phosphor-converted white light-emitting diodes for high-quality illumination, where the self-reducing behavior of doped activators and their excellent thermal stability have received significant attention. Here, we prepared NaY9Si6O26:Mn2+ red phosphors by a high-temperature solid-state reaction method, which achieved self-reduction of Mn4+ → Mn2+ and excellent thermal stability (luminous intensity at 420 K is 98% of that at room temperature) under ambient conditions. First-principles calculations and X-ray photoelectron spectroscopy elucidated a self-reduction mechanism from Mn4+ to Mn2+. The defect types were calculated in conjunction with thermoluminescence, verifying that the low thermal quenching properties originated from the transfer of electrons from the defect energy level to the Mn2+ excited state center induced by the cationic vacancy defect, which suppressed the luminescence loss from thermal quenching. In this work, the effect of defects on luminescence properties is highlighted and the further exploration of defect control is stimulated, opening up a new avenue for new types of highly thermally stable materials.
研究领域:
材料科学
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光子学
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固态化学
·
发光材料
·
LED技术
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高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 5
·055011
·
IF 2.07
Jian Zhang,Ming Wang,Zhiyong Fang,Xiaohui Lai,Zhiqiang Zhong,Rui Zhang
Bi3+-activated luminescence materials have gained growing attentions for optoelectronic applications. In this work, a novel BaLu2MgGa2Si2O12: Bi3+ garnet phosphor was synthesized through a traditional high-temperature solid phase reaction method. The crystal structure was ascertained through X-ray diffraction analysis and Rietveld structural refinement. The particle morphology and constituent elements distributions were investigated through scanning electron microscope and element mapping. Excited at 330 or 370 nm, the phosphors exhibit two emission peaks located at 413 and 495 nm, which is ascribed to the allowed transitions of Bi3+: 3P1 → 1S0. The luminescence intensity reaches the maximum at the 4 mol% Bi3+ doping content, and the emission color is easily manipulated by tuning the excitation wavelength. Besides, the luminescence intensity at 150 ℃ remains 80% of that at room temperature. These results suggest that the novel phosphors have promising application in the near-UV excited white LEDs.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 20
·1-10
·
IF 2.8
Ji Changjian,Zhang Hailong,Wang Wenjing,Yuan Huimin,Zhao Gang
In order to acquire a red light-emitting component for an efficient w -LEDs device, we synthesized a series of Eu 3+ -doped Sr 2 GaTaO 6 (SGT) phosphors using a traditional high-temperature solid-phase technique. The results of UV diffuse reflectance proved that the SGT host possesses a broad optical energy bandgap ( E gap ) of 4.47 eV (calculated value). The relevant characteristic spectra were also tested. By monitoring the emission at 612 nm, the excitation peak at 466 nm matches the blue light region (460–470 nm) of the popular blue LED chips on the market. The photoluminescence (PL) spectra of SGT: Eu 3+ phosphors at room temperature consisting of four obvious PL bands ( 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 ) in the visible range. And the PL properties are necessarily analyzed by fluorescence decay curves. And it exhibits a decent photoluminescence quantum yield (39.88%). Moreover, the color purity and the ∆E of the SGT: 0.2Eu 3+ sample are 96.5% and 0.29 eV, respectively, demonstrating that the ∆E of SGT: Eu 3+ phosphor is superior to other reported Eu 3+ -doped materials for w -LEDs applications. The results manifest that the Eu 3+ doped SGT phosphors can be outstanding candidates for w -LEDs applications with high color purity and activation energy.
研究领域:
材料科学
·
光电
·
固体化学
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Xin Zhang,Yiyuan Tang,Lvming Qiu,Kaifeng Liao,Chenghua Sun,Donal D. C. Bradley,Paul N. Stavrinou,Zhen Wu,Jingsong Huang,Guojie Wang
Perovskite nanocrystals (NCs) demonstrate exceptional potential as emitters to address Rec. 2020 standards for wide color gamut displays. However, the pure-red-targeted CsPbI 3 NCs generally suffer from imprecise synthetic control over emission wavelength and from structural instabilities that significantly diminish performance. We report a novel halogen engineering framework that addresses the otherwise unfavorable wavelength-efficiency-stability nexus. Our approach leverages surface I − ···I 2 interactions to simultaneously unlock exceptional optical characteristics and the elusive structural robustness needed for application. It achieves: (i) controlled quantum-confinement-tuned emission wavelength, (ii) near-unity photoluminescence (PL) quantum yield through iodide vacancy defect management, and (iii) excellent environmental stability, even under harsh (85°C/85%) temperature and humidity conditions, through lattice-distortion suppression. Rec. 2020 compliant, 638 nm peak light-emitting diodes (LEDs) are then demonstrated with Commission Internationale de l'Éclairage coordinates (X, Y) = (0.703, 0.297), 22% external quantum efficiency, luminance ≥ 11,000 cd m −2 , and long lifetime, establishing a materials-by-design paradigm for advancing next-generation perovskite display technologies.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Liang Yang,Jianwei Dao,Zhihao Jiang,Tiqun Wei,Zihao Han,Yajie Deng
Narrow-band red phosphors offer highly effective solution to the red-spectral deficiency that has long compromised the color rendering quality of phosphor-converted white light-emitting diodes (LEDs). Herein, we report novel tungstate-based Na 5 Lu(WO 4 ) 4 :Eu 3+ (NLWO:Eu 3+ ) red phosphor synthesized by high-temperature solid-state reaction. The distinctive tetragonal framework of the Na 5 Lu(WO 4 ) 4 host provides non-centrosymmetric Lu 3+ sites that favor the hypersensitive 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ , yielding an exceptionally pure red emission at 618.9 nm with a remarkable color purity of 96.22%. A systematic investigation of the concentration-dependent luminescence reveals that electric dipole-dipole interactions dominate the energy transfer and quenching behavior, with the optimal Eu 3+ content identified at x = 0.21. Importantly, the phosphor retains 78.7% of its room-temperature emission intensity at 423 K, corresponding to activation energy of 0.246 eV, indicative of robust thermal stability suitable for LED application. A full-spectrum white LED device was constructed by integrating the optimized NLWO:Eu 3+ phosphor with commercial blue and green components on 397 nm n-UV chip. The device delivers high-quality white light with a high general color rendering index (Ra = 87.5) and a markedly enhanced R9 value of 89.8, far exceeding that of conventional YAG:Ce-based white LEDs, along with comfortable correlated color temperature of 6038 K. This work presents a viable red phosphor solution for bridging the red gap in full-spectrum lighting, highlighting the potential of tungstate hosts as robust platforms for high-performance phosphor development.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Ruixin Song,Donglei Zhou,Renhuan Song,Yuqi Wang,Jiyuan Guo,Shangwei Zhou,Enhui Wang,Wei Li,Tingting Zhou,Xue Bai,Hongwei Song
Er 3+ -doped 1540 nm light-emitting diodes (LEDs) are critical components in optical communications C-band, non-trunk communication, bioimaging, and sensing. However, integrating high luminous efficiency with tailored circularly polarized luminescence (CPL) in such LEDs remains a critical challenge. Here, we demonstrate efficient 1540 nm short-wave infrared (SWIR) electroluminescence with distinct CPL in Cs 3 ErCl 6 nanocrystals (NCs)-based LEDs via a synergistic strategy of Sb 3+ /Y 3+ co-doping and camphor ligand modification. Y 3+ doping modulates lattice symmetry, inducing Stark splitting of the Er 3+ energy level and enhancing luminescence intensity. Sb 3+ introduction triggers efficient self-trapped excitons emission at 530 nm, whose energy levels match Er 3+ states to boost energy transfer efficiency. Subsequently, camphor ligand exchange passivates Er 3+ -related defects, increasing the 1540 nm photoluminescence quantum yield to 35.7% and endowing NCs with CPL (asymmetry factor: −3.67 × 10 −2 ) via camphor's chiral structure. SWIR LEDs based on camphor-modified Cs 3 Er 0.7 Y 0.3 Cl 6 : Sb 3+ NCs exhibit a record-high external quantum efficiency of 3.06% at 1540 nm, and first, demonstrate electrically-driven circularly polarized 1540 nm emission with asymmetry factor of −3.08 × 10 −2 . This work presents a synergistic doping-ligand strategy for Er-based halide optoelectronics, offering a versatile platform to develop high-performance long-wavelength devices with integrated efficient emission and tailored polarization, crucial for advancing next-generation optical communication and bioimaging.
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Ling Zhou,Hui Fu,Sheng Cao,Weiyou Yang,Jinju Zheng,Jialong Zhao
Vacancy-ordered double perovskites have emerged as promising candidates for single-component white light-emitting diodes (WLEDs) owing to their intrinsic broadband emission, dopant-induced color tunability, and stable optoelectronic properties. However, their practical application is limited by the difficulty of obtaining high-quality crystals, as the typically rapid and poorly controlled crystallization processes tend to induce lattice disorder and defect formation. In this work, we report a 4-mercaptobenzoic acid (4MBA)-assisted coprecipitation strategy to synthesize high-quality 3%Sb 3+ -doped Cs 2 ZrCl 6 (CZC:3%Sb (4MBA)) microcrystals (MCs). Despite its non-coordinating nature with the crystal surface, 4MBA functions as an effective kinetic regulator that retards crystallization and enhances growth control, thereby suppressing lattice disorder and defect formation to improve crystal quality. As a result, the optimized CZC:3%Sb (4MBA) MCs achieve a photoluminescence quantum yield (PLQY) of 88%, twice that of the unmodified MCs, while concurrently ensuring excellent ambient and thermal stability. Fabricated WLEDs based on CZC:3%Sb (4MBA) MCs exhibit warm white emission with a high color rendering index (CRI) of 94 and maintain stable operation over 14 h. This work presents an effective strategy for regulating crystal growth to enhance the optical performance of lead-free vacancy-ordered double perovskites, paving the way for high-performance, single-component WLEDs.
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高影响因子
Light-Science & Applications
·
2026
·Vol. 15
·期 1
·176
·
IF 24
Xie Mingyuan,Bi Chenghao,Wei Shibo,Jiang Zhentao,Li Guo,Li Hangren,Zhang Yong,Zhao Feng,Li Meng-Jiao,Lin Hui,Wang Ya-Kun,Liao Liang-Sheng,Tao Silu
Blue perovskite quantum dot light-emitting diodes (QLEDs) are highly attractive for new generation high-definition displays, but their practical deployment is hindered by severe efficiency roll-off at high brightness (>4000 cd m − ²) while maintaining high color purity (CIEy < 0.1). This roll-off arises mainly from non-radiative losses induced by exposed dangling bonds, strong inter-dot coupling, and low permittivity. To conquer this challenge, we develop a multifunctional molecule passivation strategy utilizing 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIMPF₆). The [PF₆] − anions coordinate with lead dangling bonds, cesium sites, and weaken coupling, while [EMIM]⁺ cations suppress bromine-related defects and inhibit Auger recombination, collectively reducing exciton quenching pathways. This treatment increases the photoluminescence quantum yield of QD films from 78% to 92% and enables spectrally high color purity blue emission at 472 nm (CIEy = 0.091). Crucially, the resulting devices deliver a record-high external quantum efficiency (EQE) exceeding 20% at 6441 cd m − ² and maintain 18.47% EQE at 9587 cd m − ² with nearly eliminated roll-off, representing the best performance to date for blue perovskite QLEDs (CIEy < 0.1). Moreover, the operational lifetime improves by an order of magnitude compared with previous reports.
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PubMed
高影响因子
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