JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Meiqing Yan,Jiapeng Yang,Fan Yang,Xiaojuan Liang,Weidong Xiang
As display technologies progress towards enhanced visual performance, there was a growing demand for color conversion materials to meet increasingly stringent performance requirements. In recent years, all-inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) had gained attention in the field of wide color gamut backlight displays due to their tunable full spectrum, narrow-band emission, high color purity, and ease of processing. However, red-emitting perovskite NCs were still facing challenges with photoluminescence quantum yield (PLQY) and stability. In this study, Yb 3+ doped CsPbBr 1 I 2 perovskite nanocrystal glass (Yb 3+ @CsPbBr 1 I 2 PNG) was synthesized using a melt-quenching technique. Samples emitting at a narrow band centered at 630 nm, with a full width at half maximum(FWHM) of 31.8 nm, exhibited a high PLQY of 80.36 % and retained fluorescence intensity at 98.2 % of the initial value in water, maintaining to 92.6 % after continuous blue light irradiation for 60 days. Moreover, the optical conversion film Yb 3+ @CsPbBr 1 I 2 @CsPbBr 3 @PET developed in our study showcased color gamut coverage surpassing 132.9 % of the NTSC 1953 standard and 98.8 % of the Rec.2020 standard. In summary, the highly efficient and remarkably stable red-emitting Yb 3+ @CsPbBr 1 I 2 PNG composite material introduced in this study paved the way for future advancements in wide color gamut and ultra-high definition backlight display technologies.
研究领域:
材料科学
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光学工程
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高影响因子
Journal of Materials Chemistry C
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2019
·Vol. 8
·期 5
·1746-1754
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IF 6.641
Le Wang,Ran Wei,Peng Zheng,Shihai You,Tian-Liang Zhou,Wei Yi,Takashi Takeda,Naoto Hirosaki,Rong-Jun Xie
As a new generation advanced display or projection technology, laser displays or projectors have attracted great attention owing to their ultra-high brightness, energy saving nature, brilliant image quality and/or large sizes. However, for laser displays or projectors without using three primary laser diodes, the lack of appropriate blue-laser-driven color converters is a big limitation and challenge. In this work, we propose to develop laminated phosphor-in-glass (PiG) films as laser-driven color converters for wide-color-gamut and high-brightness laser displays. The β-Sialon:Eu and CaAlSiN3-LiSi2N2-Si2N2O, Calson:Ce phosphors were chosen as the green and orange emitters, respectively, and were co-fired with glass frits on a sapphire substrate to form PiG films. No interfacial reactions between phosphors and glass were identified, and phosphor powders were uniformly distributed in the glass matrix. The phosphor content and the film thickness had an influence on the microstructure, luminance saturation and optical properties of the PiG films under laser light irradiation; both PiG films reached a maximum luminance saturation of 6.09 W mm−2 when their microstructures were optimized. The lamination architecture of the PiG films had a great impact on the optical properties of the laser-driven white light, and the maximum ones were achieved as the green-emitting PiG film was positioned on the orange-emitting film adhered to the sapphire substrate. Under 4.82 W mm−2 blue laser excitation, the laminated double-layer PiG films enabled the creation of white light with a wide color gamut of 107% NTSC, luminous efficacy of 74.44 lm W−1, luminous flux of 282.13 lm and color temperature of 7902 K. These results indicate that the laminated PiG films are promising color converters for use in high-power and wide-color-gamut laser displays or projectors.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Laser & Photonics Reviews
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2025
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IF 10
Huiying Li,Sheng Cao,Longqiang Bao,Yuwei Liu,Junyao Chen,Shihua Qin,Lin Huang,Lingyu Wan
Inorganic electrochromic (EC) devices with vibrant multicolor variations are at the forefront of EC technology and play a crucial role in display applications. Expanding the dynamic color gamut of a single EC device has long been a subject of investigation. Herein, a design is presented that employs vanadium oxide (VO x ) as the EC layer and tungsten (W) as the reflective layer to construct an asymmetric Fabry–Pérot (F–P) nanocavity, enabling wide color gamut EC displays. By leveraging the different thicknesses of VO x , this design allows for a range of color changes from yellow and orange to magenta, purple, blue, cyan, and green through dynamic EC modulation. Notably, a typical single W-VO x (150 nm) F–P nanocavity demonstrates an impressive modulation range of 110 nm, exceeding the capabilities of existing F–P nanocavities. In-depth structural analysis reveals that the insertion and extraction of Li + ions significantly influence the microstructure and optical properties of VO x film, allowing for greater refractive index adjustment than WO 3 . This facilitates precise control and expansion of the nanocavity's color range through interference effects. This study provides a new perspective for developing dynamically adjustable wide color gamut EC displays and highlights their potential applications in flexible display technologies.
研究领域:
材料科学
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Meiting Yang,Qin Wang,Yao Tong,Lanlan Zhai,Weidong Xiang,Xiaojuan Liang
All-inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) are becoming a critical material for the narrow-band fluorescent material in the field of backlit displays. Herein, CsPbBr 3 (CPB) NCs glasses with finely adjustable wavelength were successfully prepared in the narrow range of 522–533 nm by controlling the content of MgO in borosilicate glass matrix. It is surprising that the addition of MgO enhances the optical properties of CPB NCs, as well as improves their stability. Furthermore, in order to verify its application in backlight display, the light conversion film with a color gamut of up to 129% of NTSC 1953 was successfully prepared, displaying more details of object color on the liquid crystal display (LCD) screen compared with commercial one. These results undoubtedly provide a broad road for wide color gamut backlight display with respect to perovskite nanomaterials.
研究领域:
材料科学
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光学工程
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高影响因子
Nanomaterials
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2019
·Vol. 9
·期 6
·832
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IF 4.034
Shiliang Mei,Bobo Yang,Xian Wei,Hanqing Dai,Zhihao Chen,Zhongjie Cui,Guilin Zhang,Fengxian Xie,Wanlu Zhang,Ruiqian Guo
All-inorganic CsPbX3(X = Cl, Br, and I) perovskite quantum dots (QDs), an emerging type of luminescent materials, have drawn extensive attention in recent years. However, the amelioration of their stability is becoming a critical issue. Herein, we present a facile and efficient approach to prepare novel perovskite QDs/metal–organic frameworks (CsPbX3/ZIF-8) composites under ambient-atmospheric conditions. The obtained composites exhibit better properties including high photoluminescence (PL) quantum yields (QYs) (41.2% for green and 34.8% for red), narrow-band emission (20 nm for green and 31 nm for red), and enhanced stability in comparison to bare QDs. Furthermore, their application in a remote-type white-light-emitting device was explored and a wide color gamut (~137% of the National Television System Committee standard) was achieved, verifying that these novel luminescent composites have great prospect in backlight display application.Keywords:perovskite quantum dots;all-inorganic;ZIF-8;composite;wide-color-gamut display
研究领域:
材料科学
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光学
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Meiting Yang,Shun Cheng,Fan Yang,Hangtao Ye,Yihuang Chen,Weidong Xiang,Shuang Pan,Xiaojuan Liang
Metal halide perovskite has been widely researched in the field of wide color gamut backlight due to its excellent luminescence properties. However, the toxicity of lead and thermal stability issue greatly hindered its practical application. In this regard, environmentally friendly manganese halide perovskites has intrigued great attention. Herein, facile yet robust preparation of highly emissive all-inorganic manganese halides is presented via a one-step pure aqueous solution-based method without using corrosive acid solution. The introduction of Zn 2+ cation-alloying enables the weakly luminescent Cs 3 MnCl 5 to exhibit exceptionally efficient green emission at 521 nm. The alloyed Cs 3 Mn x Zn (1-x) Cl 5 exhibits superior optical properties as well as improved thermal stability. In particular, alloyed Cs 3 Mn x Zn (1-x) Cl 5 still retained 74% of the initial fluorescence intensity when the heating temperature was raised up to 225 °C. Furthermore, within the protective encapsulation of polydimethylsiloxane (PDMS) matrix, the prepared Cs 3 Mn x Zn (1-x) Cl 5 @PDMS films demonstrates excellent air, water and blue-light stability, which can be readily applied as light conversion films in backlit display. The as-prepared Cs 3 Mn x Zn (1-x) Cl 5 @K 2 SiF 6 : Mn 4+ @PDMS films displayed excellent quality and the color gamut was over 113% of the NTSC 1953 standard. This work provides a simple and effective pure aqueous-based strategy for the development of environment-friendly perovskite materials for the application of wide color gamut backlit display.
研究领域:
材料科学
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环境科学
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高影响因子
ACS Applied Electronic Materials
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2020
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IF 0
Fei Tang,Haoqi Li,Kangzhen Tian,Shijie Xu,Xiaojun Wang,Chenhui Xie,Honggang Ye,Yongge Cao
Hunting for a type of green phosphor with outstanding properties is of much significance for improving the performance of display backlights. In this work, a series of efficient Eu2+-activated RbLi7Si2O8 (denoted as RLSO:Eu2+) green phosphors with different doping concentrations were prepared via a low-temperature solid-state reaction approach under a reduced atmosphere. Photoluminescence (PL) measurements show that the prepared green phosphor with 8 atom % doping concentration of Eu exhibits the best internal quantum yield (IQY) of 95.8%. Besides, the phosphor delivers a good anti-thermal quenching behavior at temperatures <200 K, that is, there is no significant drop in luminescence intensity. Such thermal behavior is well consistent with the temperature dependence of measured luminescence lifetimes. The spectral analysis of the low-temperature luminescence spectrum with a semiclassical time-dependent approach reveals that three electronic levels of the Eu2+ ion coupled with a common low-frequency vibrational phonon mode with an energy of 21 meV shall be responsible for the high-efficiency luminescence of the prepared phosphor. Using the as-prepared green phosphor and K2SiF6:Mn4+ red phosphor, a white light-emitting diode (LED) device with high luminous efficacy (111.08 lm/W) and wide color gamut (112% NTSC) is fabricated on an InGaN blue chip.
研究领域:
材料科学
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光学工程
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DOI
OPTICS LETTERS
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2024
·Vol. 49
·期 9
·2245-2248
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IF 3.1
Xiaolan Zhou,Xiaolan Zhou,Shengyuan Chen,Shengyuan Chen,Cong Zhang,Cong Zhang,Xu Huang,Xu Huang,Kailei Lu,Kailei Lu,Jianqi Qi,Jianqi Qi,Jianqi Qi,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu
Narrowband green-emission, combined with superior physicochemical stability and thermal performance, is regarded as a common pursuit in backlight display applications. However, mainstream phosphor-converted materials composed of resin or silicone resin easily encounter the dilemma of thermal decomposition and chemical corrosion for practical use. To overcome this problem, in this work, Mn2+/Mg2+ co-doped AlON ceramic is successfully realized with ultra-narrowband green-emission and high transparency. The luminescent property of AlON: Mn2+–Mg2+ ceramic exhibits narrowband green emission centered at 509 nm with a full width at half maximum of 36 nm, which is smaller than the corresponding powder counterpart (44 nm). Moreover, AlON: Mn2+–Mg2+ ceramic presents a wide color gamut (103.6%) and high color purity (74%). Concurrently, high transmittance of this ceramic, at 82%, unveils a potential innovation in the display technology field. This work may facilitate the development of narrowband green light-emitting converters based on AlON: Mn2+–Mg2+ transparent ceramics in large color gamut backlight display applications.
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材料科学
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光学工程
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高影响因子
Science China-Information Sciences
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2024
·Vol. 67
·期 5
·1-7
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IF 7.3
Zhang Yong,Wei Xin,Gao Lei,Zhao Weijie,Sun Changjiu,Wei Junli,Yuan Mingjian,Ni Zhenhua,Lu Junpeng,Liu Hongwei
The wider color gamut represents the better reproducibility of the real natural colors. Perovskite materials exhibit promising potential in full-color wide-gamut displays because of the wide tunability and high saturability of their photon emission. However, the full-color wide gamut (>100% Rec.2020) has not been constructed due to the lack of the extreme red primary color (∼700 nm). Herein, the widest color gamut is realized, wherein α -CsPbI 3 is used to generate the extreme red primary color. An in-situ encapsulation approach is advised to stabilize α -CsPbI 3 at room temperature by means of polyvinylpyrrolidone (PVP). The α -CsPbI 3 encapsulated by PVP (denoted as P-CPI) shows highly saturated (FWHM (full width at half maximum) ∼28 nm) and extremely (∼697 nm) red emission. The green emission is provided by P-CPBr (CsPbBr 3 with PVP) which is also synthesized using the universal in-situ encapsulation approach. With the assistance of a commercial GaN chip, the RGB gamut is extended to the widest (151% NTSC, 113% Rec.2020).
研究领域:
材料科学
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高影响因子
Journal of Materials Chemistry C
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2019
·Vol. 7
·期 8
·2401-2407
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IF 6.641
Yong Liu,Zhi Zhou,Lin Huang,Mikhail G. Brik,Shuaichen Si,Litian Lin,Tongtong Xuan,Hongbin Liang,Jianbei Qiu,Jing Wang
Narrow-band red-emitting fluoride phosphors for wide color gamut LED backlights have evoked considerable attention, due to their fascinating optical properties. Unfortunately, poor moisture resistance often restricts their further applications in optoelectronics. Herein we developed a Cs2SiF6:Mn4+ red phosphor using a low-temperature co-precipitation method and passivating it by using H2O2. The phosphor shows a very high external quantum efficiency (EQE) of ∼85% and exhibits excellent moisture stability retaining 74% of its emission intensity after being exposed to high temperature (85 °C) and high humidity (85%) (HTHH) for 168 h. Finally, the high brightness white LED devices combined with the passivated Cs2SiF6:Mn4+ exhibit high luminous efficacy of 133 lm W−1 and wide color gamut (∼84.7% NTSC). The results demonstrate that the passivated Cs2SiF6:Mn4+ with high EQE and excellent moisture-resistance is promising as a narrow-band red emitting phosphor for wide color gamut LED backlights.
研究领域:
材料科学
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光电技术
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光子学
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 7
·2102141
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IF 10.05
Hong Ming,Yifei Zhao,Yayun Zhou,Maxim S. Molokeev,Yuanjing Wang,Shuai Zhang,Enhai Song,Shi Ye,Zhiguo Xia,Qinyuan Zhang
The design and discovery of Mn 4+ -activated fluoride phosphors that can secure both high luminescence efficiency and short fluorescence lifetime simultaneously are crucial and urgent for constructing high-quality wide-color gamut (WCG) backlight display applications. Herein, a series of brand-new Mn 4+ -activated narrow-band red-emitting phosphors with both high external quantum efficiency (EQE, >50%) and short fluorescence lifetime (τ ≤ 3.8 ms) are designed by introducing Mn 4+ into newfound tetramethylammonium (Me 4 N)-based organometallic fluoride (Me 4 N) 2 B F 6 ( B = Ge, Ti, Zr) hosts. These intriguing properties of Mn 4+ arise from the larger steric hindrance of (Me 4 N) + cations and low local structure symmetry in the 0D (Me 4 N) 2 B F 6 , as verified by the structural and spectral analyses. (Me 4 N) 2 GeF 6 :Mn 4+ , as a representative, shows a high EQE of ≈64.6% and a short lifetime of ≈3.78 ms. A prototype projector with superb performance is assembled by employing a remote (Me 4 N) 2 GeF 6 :Mn 4+ -based white light-emitting diode with high luminous efficiency (≈143.09 lm W −1 ) and WCG (≈112.02% National Television System Committee (NTSC)) to demonstrate their great potentials for backlight applications. The research brings up a promising alternative as the host materials for Mn 4+ -doped fluoride phosphors and provides a deeper understanding on the correlation between structure and luminescence.
研究领域:
材料科学
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光学
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高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Zuobin Tang,Feng Du,Zhihua Leng,Huidong Xie,Yanyan Li,Lei Zhao
Ultra-narrow-band phosphors have gained widespread applications in lighting and displays to enhance brightness and improve color saturation. Typical phosphor designs employ UCr 4 C 4 -type compounds and designing new narrow-band phosphors with high color purity is a major challenge. Here, we explored a Eu 2+ -doped Ba 5 GeO 4 Br 6 phosphor, showing a narrow-band blue emission ( λ em = 436 nm) excitation at the near-ultraviolet light with a full width at half maximum of 30.7 nm and high color purity of 96.6%. In addition, attractive cathodoluminescence characteristics were systematically analyzed by varying filament current (30 – 70 mA) and accelerating voltage (3 – 7 eV). Robust anti-degradation behavior and color point stability under continuous electron beam bombardment were confirmed. Given its excellent performance in photoluminescence and cathodoluminescence, application in wide color gamut displays appears promising. Using commercial phosphors β -SiAlON:Eu 2+ and K 2 SiF 6 :Mn 4+ as green and red light converters respectively, and the title phosphor as the blue light converters, the fabricated w-LED exhibits a wide color gamut of 82% NTSC.
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材料科学
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光学工程
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高影响因子
危险品化学品经营许可证（带存储）