ACS Nano
·
2025
·
IF 16
Yu Lou,Haoran Wang,Zhicong Zhou,Miao Zeng,Zhongliang Yan,Xueying Yang,Pengfei Fu,Arui Huang,Dong Li,Tom Wu,Yang Bai,Hui-Ming Cheng
Pure-red perovskite light-emitting diodes (PeLEDs) are critical for next-generation displays, while existing systems based on mixed Br/I compositions, quasi-2D phases, or colloidal 0D quantum dots are still facing challenges in fulfilling the requirements of the Recommendation BT.2020 (Rec. 2020) red standard. CsPbI3 nanoplatelets (NPLs) whose bandgap depends on thickness-size are a promising candidate for pure-red light-emitting emitters, but their practical use as LEDs has been hampered by the metastability of the emissive CsPbI3 cubic phase. Here, we report the synthesis of stabilized γ-CsPbI3 NPLs with a tailored surface coordination by incorporating a trace amount of dimethyl sulfoxide (DMSO) and N,N’-dimethylpropyleneurea (DMPU) into the precursor. These ligands selectively coordinate with undercoordinated Pb2+ sites in [PbI6]4– octahedra through Lewis acid–base interactions, redistributing the electron density at Pb centers and inducing lattice distortion by the Pb–I–Pb bond angle torsion, thereby stabilizing the γ-phase. The complementary effect of the polarities and the coordination capacities of DMSO/DMPU guide anisotropic growth along the [100] direction, enabling atomic-precision control of the NPL thickness (4 monolayers) to tailor the quantum-confined pure-red emission. The resultant pure-red PeLEDs achieve Commission Internationale de l’Eclairage (CIE) coordinates of (0.708, 0.292), 100% compliance with the Rec. 2020 specification, as well as an external quantum efficiency (EQE) of over 12% and a superior operational lifetime with a half-lifetime (T50) of 360 min, representing the highest reported values for CsPbI3 NPL-based PeLEDs.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yi Zhu,Feng Tong,Zheng Chen,Zijun Huang,Sheng Huang,Xiuquan Gu
This study addresses the challenge of synthesizing highly emissive and stable MAPbBr 3 nanocrystals (NCs) for practical device applications. A double-passivation approach was developed through using nitrogen-doped graphene quantum dots (NGQDs) and polyvinylidene fluoride (PVDF) during the in-situ synthesis of MAPbBr 3 NCs. By optimizing the amount of NGQDs, the resulting MAPbBr 3 /PVDF/NGQDs composite films exhibited green emission at 522 nm with a narrow spectral width of 17.7 nm. The films demonstrated exceptional stability, retaining 60 % of their initial photoluminescence (PL) intensity after 144 h of water immersion and 96 % of their initial intensity after 10 min of heating at 100 °C. This stability is attributed to the NGQDs reducing defects and acting as nitrogen-enhanced sites that promote consistent crystal formation. Additionally, the composite film was used to fabricate a white light-emitting diode (WLED) with a color gamut coverage rate of 125 % under the National Television Standards Committee (NTSC) standard and 93.8 % under the Rec.2020 standard. This work might present a synergistic strategy combining in-situ defect passivation with encapsulation, offering a viable solution to the stability-efficiency trade-off in perovskite NCs and advancing high-color-gamut flexible displays.
研究领域:
材料科学
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光电技术
·
纳米技术
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高影响因子
Materials Chemistry Frontiers
·
2025
·
IF 6.4
Qianrong Jin,Yuexiao Pan,Yali Tang,Suqin Chen,Jun Zou,Yingnuo Chen
The exploration of novel phosphors with excellent properties is of great significance for both fundamental research and practical applications in optoelectronic devices. In this study, we report the synthesis of a new 0 dimensional (0D) organic-inorganic hybrid metal halide (OIHMH), C6H14N2ZnCl4, upon doping with Mn²⁺ ions, it exhibits bright green emission centered at 535 nm, originating from the d-d transition of tetrahedrally coordinated Mn²⁺ ions. The sample achieve photoluminescence quantum yields (PLQYs) of 70% at a doping concentration of 40% and demonstrate good thermal stability, with luminescence intensity restored after a heating-cooling cycle. The as-prepared Mn²⁺-doped C6H14N2ZnCl4 crystals were further utilized to fabricate white light-emitting diodes (WLEDs), which demonstrated good performance with a correlated color temperature (CCT) of 6003 K and a color rendering index (CRI) of 79. Additionally, the bright green emission of the doped crystals was explored for anti-counterfeiting applications, showing promising potential in security marking. This work highlights the potential of Mn²⁺-doped OIHHPCs as high-performance phosphors for optoelectronic applications and security purposes.
研究领域:
材料科学
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光学
·
电子工程
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高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Mingjin Li,Ruiru Liu,Xiao Wang,Yuwei Pu,Fei Zheng,Zhenfu Zhao,Ziyang Hu
Mixed-halide bromine-iodine perovskite quantum dots (PeQDs) exhibit remarkable spectral tunability, making them highly suitable for pure red perovskite light-emitting diodes (PeLEDs). However, surface defects in these PeQDs facilitate halide ion migration and non-radiative recombination, which impair PeLED performance. Here, we introduce an innovative post-treatment strategy employing pseudohalogen inorganic ligands in acetonitrile to simultaneously etch lead-rich surfaces and passivate defects in-situ . This method produces high-quality CsPb(Br/I) 3 PeQDs with suppressed halide migration, enhanced photoluminescence quantum yield (PLQY), and improved film conductivity. Consequently, our spectrally stable champion PeLEDs achieve a peak external quantum efficiency (EQE) of 22.1%, one of the highest reported for mixed-halide CsPb(Br/I) 3 PeQDs, representing a significant advancement in perovskite optoelectronics.
研究领域:
材料科学
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光电子学
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纳米技术
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半导体器件
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Polymers
·
2025
·Vol. 17
·期 18
·2558
·
IF 4.9
Qiming Huo,Zhuo Lv,Shengyu Feng,Dengxu Wang,Hongzhi Liu
The development of a straightforward strategy for preparing organic fluorescent materials, fine-tuning white-light emission, and subsequently constructing white light-emitting diodes (LEDs) is of great significance. Herein, we report on the modulation of white-light emission and the fabrication of white LEDs using polyhedral oligomeric silsesquioxane (POSS)-based fluorescent hybrid porous polymers (HPPs) through simple physical blending. Two HPPs, namely HPP-1 and HPP-2, which emit blue and red light, respectively, were synthesized via the efficient Heck reactions of octavinylsilsesquioxane with 4,4′-dibromobiphenyl and 1,3,6,8-tetrabromopyrene. By physically doping of HPP-1 and HPP-2 in variable ratios in solvent suspensions, it was discovered that white-light emission is significantly influenced by the concentrations of the materials and the excitation wavelength. Similar findings were also observed in the solid-state physical doping. An ideal white light emission with a CIE coordinate of (0.33, 0.33) can be achieved when excited at 380 nm with a mass ratio of HPP-1 to HPP-2 of 1:2. Finally, the two HPPs were dispersed in polysiloxane matrices, and a white LED with a CIE coordinate of (0.42, 0.36) was obtained. The LED exhibited a color rendering index of up to 90 and a correlated color temperature of 2858 K, realizing warm white light emission. This simple and convenient white-light regulation strategy holds great promise for application in the development of novel white LEDs based on organic fluorescent porous materials.
研究领域:
材料化学
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光电子学
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高分子科学
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发光材料
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固态照明
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 12
·1-13
·
IF 2.8
Wang Leilei,Ji Xiaohui,Xiao Kefeng
A series of red-luminescence bismuthate phosphors of double perovskite BaBiNaTeO 6 doped with trivalent europium (Eu 3+ ) were prepared by the solid-state diffusion method. The crystal structure and phase purity of the phosphors were analyzed. The photoluminescence (PL) properties of BaBiNaTeO 6 :Eu 3+ were studied in detail. Upon blue light (466 nm) excitation, the powders showed brilliant red light at around 619 nm, and it was attributed to the electric dipole (ED) 5 D 0 → 7 F 2 transition of Eu 3+ . The optimal dopant concentration ( x ) of the as-prepared phosphor was x = 0.60 mol and the concentration quenching mechanism was evaluated as the electric quadrupole–quadrupole interaction. The BaBiNaTeO 6 :Eu 3+ exhibited good thermal stability and the corresponding activation energy ( E a ) was obtained to be 0.27 eV. The chromaticity points of phosphors were near the edge of the red region of the Commission Internationale De L’Eclairage (CIE) 1931 chromaticity diagram. As-prepared white LED based on the GaN blue chip exhibited relatively low correlated color temperature (CCT) of 5042.5 K and high color rendering index (CRI) of 91.6. All characterizations suggest that these double perovskite BaBiNaTeO 6 :Eu 3+ red-emitting phosphors have promising applications in illumination and display field based on blue LEDs.
研究领域:
材料科学
·
光学
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高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Zhiyu Yang,Guangxiang Lu,Tao Yang,Xianju Zhou,Li Li,Yayun Zhou,Zhengliang Wang
Mn4+-doped fluorides are renowned for their highly efficient narrow-band red emission, making them promising candidates for white light-emitting diodes and wide-gamut displays. However, performance degradation at high power levels and insufficient moisture resistance limit their application. Herein, a millimeter-sized hexagonal Rb2GeF6:Mn4+ single-crystal phosphor with superior photoluminescence quantum efficiency (QE ≈ 97%) was synthesized via a one-step saturated crystallization method. The single crystal demonstrates high stability in aqueous environments compared to its powdered counterpart, attributed to reduced hydrolysis of the [MnF6]2– group. The calculated band structure of Rb2GeF6 reveals it to be a nonmagnetic, direct band gap semiconductor with a 5.89 eV band gap. A white LED device incorporating the red-emitting crystal and yellow-emitting Y3Al5O12:Ce3+ achieves a high color-rendering index of 84.5 at a low correlated color temperature of 2296 K, demonstrating the potential for advanced warm white LEDs. This research provides a foundation for the development of high-efficiency Mn4+-doped fluoride single-crystals for lighting applications.
研究领域:
材料科学
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光学工程
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LUMINESCENCE
·
2019
·Vol. 35
·期 1
·138-143
·
IF 1.691
Xiaoshuang Li,Lite Zhao
Energy storage phosphors with millisecond period afterglow that compensate for the diming time of alternating current light-emitting diodes (AC-LEDs) have promising application. To obtain a persistent luminescence (PersL) white colour in AC-LEDs, we focussed on a red afterglow with short period phosphorescence. Ca 4 Ti 3 O 10 forms a type of perovskite-related Ruddlesden–Popper phase structure. Doping Pr 3+ ions into Ca 4 Ti 3 O 10 , an ideal red PersL was obtained. X-ray diffraction and element analysis demonstrated that our target samples were crystallized well. Steady-state and afterglow luminescence properties were investigated in detail. Notably, the PersL intensity was dependent on various excitation wavelengths. By measuring three-dimensional thermoluminescence spectra, we found that the trap depths showed a continuous distribution and that the shallowest trap contributed to the millisecond afterglow. Two PersL mechanism models were used to elucidate the electron charging and de-trapping processes under UV or blue light activation.
研究领域:
材料科学
·
光学
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 96
·期 3
·753-762
·
IF 2.008
Zhu Rui,Bi Zun,Jia Ke,Liu Yunfei,Lyu Yinong
A series of single-component ScF 3 :Dy 3+ , Eu 3+ , Ce 3+ phosphors prepared by means of microwave hydrothermal method were explored for light-emitting diodes. The as-prepared samples were characterized via X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectroscopy. In order to rationalize the experimental results, first-principle calculations based on density functional theory had been carried out to discover electronic structures. PL performance of the RE 3+ -doped phosphors exhibited well-defined bands in the visible region. By adjusting the ratios of Ce/Dy/Eu, the color of the as-prepared phosphors can vary from blue (0.24, 0.23) to red (0.51, 0.30) across the white (0.34, 0.26) region according to the chromaticity coordinates. The results suggested that the Dy/Eu/Ce-doped ScF 3 might act as down-convert phosphors for near ultraviolet light-emitting diodes, especially for white LEDs. What is more, it can also promote a deep comperhension of the relationship between structure and properties in ScF 3 -based phosphors.
ScF 3 :RE 3+ phosphors with alterable bandgaps can emit light from blue to orange–red across white under the excitation of near ultraviolet light. Introduction of rare earth ions induced the variation of energy band structures in ScF 3 -based phosphors because of the existence of f , p , and d orbits in RE 3+ , therein f and p orbits of RE 3+ made the band structure downwards, the p hybridizing with Sc-3 d promoted the band toward high-energy region.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Zongjie Zhang,Liangling Sun,Balaji Devakumar,G. Annadurai,Jia Liang,Shaoying Wang,Qi Sun,Xiaoyong Huang
In this paper, a series of Eu 3+ -activated double-perovskite Ca 2 LaTaO 6 (abbreviated as CLT: x Eu 3+ ; x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8) red-emitting phosphors have been successfully synthesized via the conventional high-temperature solid-state reaction method. These samples were characterized by X-ray diffraction, Rietveld refinement , field-emission scanning electron microscope , elemental mapping, energy-dispersive spectrum, room-temperature photoluminescence , decay lifetimes, quantum efficiency, CIE color coordinates, and temperature-dependent emission spectra . Interestingly, under blue excitation into the 7 F 0 → 5 D 2 transition of Eu 3+ at 466 nm, the CLT: x Eu 3+ phosphors could emit bright red light corresponding to the 5 D 0 → 7 F J (J = 1, 2, 3, 4) transitions. Their luminescence properties have been investigated as a function of the Eu 3+ ions concentration . It was found that the CLT:0.4Eu 3+ sample exhibited the strongest emission intensity, and the concentration quenching effect was caused by the dipole-dipole interaction among Eu 3+ activators. Impressively, the emission intensity of the as-prepared CLT:0.4Eu 3+ phosphors was about 4.3 times higher than the commercial Y 2 O 3 :Eu 3+ red phosphors. Moreover, the CLT:0.4Eu 3+ sample had excellent CIE color coordinates of (0.665, 0.334) and supereminent color purity of 95.3%. Notably, the study on temperature-dependent emission spectra of the CLT:0.4Eu 3+ sample revealed its good thermal stability and color stability at high temperatures. These excellent photoluminescence properties of CLT:0.4Eu 3+ phosphors indicated their promising application potential in white light-emitting diodes as blue-light-excitable red phosphors.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Decai Huang,Youfu Zhou,Wentao Xu,Zhangfu Yang,Zhuguang Liu,Maochun Hong,Yuanhua Lin,Jianchang Yu
The red phosphor Na 5 Eu(WO 4 ) 4 activated with trivalent M 3+ (M 3+ = Bi 3+ , Sm 3+ ) ions were prepared through the solid state reaction technique. The properties of structure, morphology, photoluminescence were characterized systematically. The lattice parameters were refined by Rietveld method. The emission spectra, excitation spectra, and decay curves were employed to study the luminescent behaviors. Both of Bi 3+ and Sm 3+ doping could increase the red-emitting intensity and corresponding quantum efficiency (QE) of Na 5 Eu(WO 4 ) 4 host. Furthermore, the color rendering index of the commercial yellow phosphor YAG:Ce 3+ was increased from 44.5 to 50.8 and 50.2 by mixed with Na 5 Eu 0.8 Bi 0.2 (WO 4 ) 4 and Na 5 Eu 0.96 Sm 0.04 (WO 4 ) 4 phosphors under 465 nm excitation, respectively. The CIE chromaticity coordinates of these phosphors are close to the standard value for red. Herein, the present materials are promising candidates as red phosphors for white light emitting diodes with near-UV/blue GaN-based chips.
研究领域:
材料科学
·
光电
·
光子学
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高影响因子
Optical Materials Express
·
2017
·Vol. 7
·期 9
·3065-3076
·
IF 2.591
Wanlu Zhang,Wu Yang,Ping Zhong,Shiliang Mei,Guilin Zhang,Guoping Chen,Guoxing He,Ruiqian Guo
The spectral optimization for maximizing limited luminous efficacy (LLE) of correlated color temperature (CCT) tunable white light-emitting diodes (LEDs) with two, three and four color perovskite quantum dots (QDs) excited by a blue chip was investigated under the constraint of designated ultrahigh color rendering index (CRI) and color quality scale (CQS). The results show that high quality white lights with CRIs of 96-97, CQSs of 95-96, and LLEs of 243-225 lm/W at CCTs of 2700 K to 6500 K could be realized by the QDs-converted white LEDs (QD-WLEDs) using a blue chip and different combinations of perovskite quantum dots. The luminous efficacies of QD-WLEDs are expected to reach 114 to 122 lm/W at CCTs of 2700 K to 6500 K, if the radiant efficiency of a blue chip is 60% and the real PLQY values of perovskite QDs are 75%. These results demonstrate that perovskite QD-based LEDs are expected to be promising in next generation display and lighting technologies.
研究领域:
光学工程
·
材料科学
·
照明技术
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高影响因子
危险品化学品经营许可证（带存储）