APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Ding,Yufeng Zhou,Ziyao He,Qingyun He,Xiaojuan Liang,Wei Xia,Weidong Xiang
All-inorganic perovskites have been considered next-generation color converters in the backlit due to their shining optical properties. However, structural instability severely limits their pragmatic applications. Here, CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) were successfully embedded in polydimethylsiloxane (PDMS) films by a facile two-step method. As-prepared PDMS films containing CsPbBr 3 /Cs 4 PbBr 6 MCs (CsPbBr 3 /Cs 4 PbBr 6 @PDMS) obtain high brightness and excellent stability. Meaningfully, the PDMS films not only serve as a double protective matrix that can be used to improve the stability of CsPbBr 3 /Cs 4 PbBr 6 MCs, but also a flexible substrate with high transparency that allows the CsPbBr 3 /Cs 4 PbBr 6 @PDMS films to be used as color conversion materials for backlit displays. To our surprise, when PDMS is coated with CsPbBr 3 /Cs 4 PbBr 6 MCs, the water, thermal and photostability are greatly improved, while the photoluminescence intensity only lost by 10%. Furthermore, by mixing CsPbBr 3 /Cs 4 PbBr 6 MCs with K 2 SiF 6 :Mn 4+ phosphors in PDMS, a monolithic film with high performance was obtained. Its color gamut can reach 127% of the NTSC 1953 standard and 95% of the REC. 2020 standard, exhibiting the bright prospects in the backlit display field.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2100012
·
IF 9.926
Yao Tong,Qin Wang,Enrou Mei,Xiaojuan Liang,Wei Gao,Weidong Xiang
All-inorganic perovskite (CsPbX 3 , X = Cl, Br, I) nanocrystals (NCs) with promising optical properties are recognized as a rising star among photoelectric materials, but their inevitable instabilities limit extensive application. Herein, a new one-step strategy for encapsulating CsPbX 3 NCs with porous zeolite via the hot injection method is explored. By altering the mole ratio of PbX 2 , the emission wavelength of CsPbX 3 @zeolite is found to be regularly modulated from blue-emission (CsPbCl 2 Br@zeolite, 436 nm) to red-emission (CsPbBrI 2 @zeolite, 648 nm), thus enabling full spectrum adjustment. Due to the surface passivation of zeolite to CsPbX 3 NCs, CsPbX 3 @zeolite possess an outstanding quantum yield and display excellent thermal/photo/air stability. Subsequently, white light-emitting diodes based on green-CsPbBr 3 @zeolite and red-CsPbBrI 2 @zeolite are constructed and applied to the backlit display, achieving a wide color gamut of 134.2% for NTSC 1953 and 99.8% for Rec. 2020. The CsPbX 3 @zeolite implanted with a polymethyl methacrylate film is used to realize upconversion emission under an 800 nm laser at room temperature. Furthermore, amplified spontaneous radiation based on CsPbBr 3 @zeolite films is achieved. These results convincingly indicate broad application prospects for CsPbX 3 @zeolite prepared via this simple method.
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Qin Wang,Yao Tong,Meiting Yang,Hangtao Ye,Xiaojuan Liang,Xin Wang,Weidong Xiang
In the current situation of energy shortages, saving energy and reducing consumption are undoubtedly valid methods to relieve the pressure on resources. CsPb X 3 ( X = Cl, Br, and I) perovskites as star inorganic materials have drawn growing attention owing to their unique properties, making them suitable for applications such as light-emitting diodes (LEDs), solar cells, photodetectors, or lasers. This work presents zinc oxide (ZnO) induced self-crystallized CsPb(Br/I) 3 perovskite with a 26% photoluminescence quantum yield (PLQY) prepared by the traditional melt-quenching method. Furthermore, the full width at half maximum (FWHM) (34–44 nm) can be regulated by the ZnO content. In addition, as a downconverter, CsPb(Br/I) 3 perovskite nanocrystals (NCs) realize a bright red backlight that covers ≈ 94% Rec. 2020 standards in the CIE 1931 color space and 126% of National Television System Committee (NTSC). This finding undoubtedly confirms an effective path for fabricating perovskite materials in a green, low-cost, and time-saving way, enriching the knowledge of glass crystallization mechanisms and promoting their applications in wide color gamut backlights.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wenya Chen,Qiao Huang,Qingyun He,Shun Cheng,Xiaojuan Liang,Zhaoping Chen,Weidong Xiang
Nowadays, an all-inorganic metal halide perovskite (CsPbX3, X = Cl, Br, and I) has shown excellent prospects in liquid crystal display (LCD) backlight device applications. However, in order to better meet the market’s development, the stability of CsPbX3 still remains an urgent problem to be solved. Herein, a heat-water cyclic process of CsPbBrI2 glass powder (RGP) designed to improve stability is proposed. Excitingly, the treated RGP shows better optical properties and heat resistance. Moreover, RGP@PS was prepared with high blue light, water, and heat stabilities. It is particularly noteworthy that RGP6@PS was continuously exposed for 268 h at 60 °C and 90% relative humidity in the blue light (447 nm, 880 W/m2) environment with no decrease in brightness. It illustrates that the CsPbX3 films have made an important breakthrough in stabilities. The LCD device based on RGP@CsPbBr3@PS was designed with a wider color gamut (126%) compared with NTSC 1953. This study explores a new strategy to improve the stability of CsPbX3 thin films for LCD light conversion films.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xiaoting Liu,Wenya Chen,Jiapeng Yang,Xiaojuan Liang,Xiaoli Fang,Weidong Xiang
As we all know, the various excellent properties of perovskite nanocrystals (NCs) have attracted attention in recent years. However, thei work stability is still the bottleneck to be solved urgently in their commercialization process. In this study, we encapsulated CsPbBr3 quantum dots in nano-SiO2 (inorganic) by a high-temperature sintering method and investigated the changes in optical stability before and after encapsulation. The SiO2 shell can effectively suppress anion exchange and photodegradation, which greatly improves the photothermal stability of shell NCs. Preparation of composite films by mixing CsPbBr3–SiO2 (inorganic) and polymer material PMMA (organic) by a solvent solution method can further enhance its stability. Meanwhile, the backlight display device realized the practical application of CsPbBr3–SiO2/CsPbBr1.2I1.8@PMMA with a wide color gamut (112% of the NTSC, 84% of the Rec. 2020). This is a very significant step to open up the awkward situation of the practical application of perovskite NC materials in backlight displays.
研究领域:
材料科学
·
光电技术
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
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
·
显示技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 30
·9203-9210
·
IF 6.641
Y. Y. Zhou,E. H. Song,M. G. Brik,Y. J. Wang,T. Hu,Z. G. Xia,Q. Y. Zhang
Mn4+-doped fluoride red-emitting phosphors have been developed for backlighting white light-emitting diodes (WLEDs). However, the long fluorescence lifetime (τ > 5 ms) leads to the image-retention phenomenon for the human eye when Mn4+ is doped into equivalent X sites in A2XF6 (A = Na, K, Rb, Cs; X = Si, Ge, Ti, Zr). Herein, we report on novel red-emitting A2NaScF6:Mn4+ (A = K, Rb, Cs) (ANSF) phosphors with short fluorescence lifetimes (τ < 4 ms) and characteristic zero phonon line (ZPL) emission, which can be realized via non-equivalent doping of Mn4+ into Sc3+ sites. Density functional theory (DFT) calculations verified the formation of a slightly distorted environment of Mn4+ and an Na+ vacancy to balance the charge with Mn4+ non-equivalent doping. The WLED backlight using ANSF as a red-light component can reach a wide color gamut above 105% of the National Television Standards Committee (NTSC) standard, and the image-retention on the backlighted screen can be effectively avoided compared to the backlight obtained using commercial K2SiF6:Mn4+. Such a Mn4+ non-equivalent doping strategy opens a new perspective for the modification of local symmetry and enhancement of the luminescence properties of Mn4+-doped red-emitting fluoride phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2022
·Vol. 16
·期 4
·5894-5899
·
IF 10.269
Liu Xiaoting,Yang Jiapeng,Chen Wenya,Yang Fan,Chen Yihuang,Liang Xiaojuan,Pan Shuang,Xiang Weidong
High efficient lead halide perovskites with wide-color gamut properties have emerged as new candidates for backlight displays. However, the toxicity of lead and the instability of halide perovskites greatly limit their practical applications. Herein, the luminescent powders of [(CH 3 ) 4 N] 2 MnBr 4 and [(CH 3 ) 4 N]MnBr 3 were synthesized via a simple yet robust solvent evaporation method. [(CH 3 ) 4 N] 2 MnBr 4 with tetrahedral coordination Mn 2+ and [(CH 3 ) 4 N]MnBr 3 with octahedral coordination Mn 2+ show green at 517 nm and red emission peaks at 620 nm, respectively, originating from the 4 T 1 - 6 A 1 transition of Mn 2+ . To enhance optical of manganese halide via effective alloying, Zn 2+ -doped [(CH 3 ) 4 N] 2 MnBr 4 was successfully prepared, and the quantum efficiency of [(CH 3 ) 4 N] 2 Mn 0.6 Zn 0.4 Br 4 was as high as 65%. Furthermore, [(CH 3 ) 4 N] 2 Mn 0.6 Zn 0.4 Br 4 exhibits better optical and thermal stability compared to [(CH 3 ) 4 N] 2 MnBr 4 . [(CH 3 ) 4 N] 2 Mn 0.6 Zn 0.4 Br 4 @CsPbBr 1.2 I 1.8 light conversion films with different green-to-red ratios are placed in backlight display devices, and their color gamut exceeds 106% of the National Television Standards Committee (NTSC) 1953 standard, which is superior to the currently reported Mn-based perovskite. This work broadly shows that the [(CH 3 ) 4 N] 2 Mn 0.6 Zn 0.4 Br 4 will provide effective route to fabricate stable and high-performance lead-free liquid crystal displays.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yong Liu,Shuai Cheng,Shengchun Yang,Zongtao Li,Zhenjuan Duan,Zhanjiang Hu,Zhengui Li,Yuehua Li,Lili Yu,Anzhong Peng,Xiaodong Wen
A series of Mn 4+ doped cubic phase Cs 2 KInF 6 red phosphors (abbreviated here as CKIFM) were obtained through a typical co-precipitation route. The optical and structural properties of this material were researched in more detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and photoluminescence excitation (PLE), diffuse reflectance spectroscopy (DRS), temperature-dependent PL and lifetimes. Interestingly, the as-prepared CKIFM phosphors have a strong and broad absorption band in the blue area with a peak at 468 nm, and bright narrow-band red fluorescence with high colour purity. Furthermore, the optimum quenching concentration, crystal field parameters (CFPs), internal quantum efficiency (IQE), and the corresponding concentration quenching mechanism are discussed and analyzed in detail. Finally, the WLED backlight using the obtained CKIFM red-emitting phosphor and β-SiAlON:Eu 2+ (β-Sialon:Eu 2+ ) green-emitting phosphor demonstrates a wide color gamut (∼101.7% National Television System Committee standard (NTSC)), revealing the title phosphor is an attractive red component for backlight displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 19
·6358-6363
·
IF 7.059
Rui Cheng,Kangzhe Ma,Hong-Gang Ye,Luting Ling,Guan Wu,Cai-Feng Wang,Su Chen
Quantum dots (QDs) have gained extensive attention owing to their outstanding photoelectric properties. However, the fast and continuous synthesis of QDs remains a challenge. Herein, for the first time, we develop a magnetothermal microfluidic technique (MMT) to rapidly synthesize CdSe and CdSe@ZnS QDs with higher optical performance and continuous production. The as-prepared CdSe@ZnS QDs exhibit relatively high photoluminescence quantum yields (PL QYs) (∼70%). Meanwhile, by manipulating the fluid rate and reaction temperature of the MMT, the emission wavelengths can be tuned in the visible region from 515 to 625 nm. Furthermore, the red emissive CdSe@ZnS QDs are used as fluorescent conversion materials in a backlight display, which shows a wide color gamut around 112%. Our purpose is to highlight a new powerful platform of the MMT for rapid, accurate, and continuous fabrication of photoluminescent nanomaterials, which will guide the substantial progress of backlight displays and light emitting diodes (LEDs).
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2401-2407
·
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
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Guojun Zhou,Yan Xu,Zhiguo Xia
Quasi-two-dimensional perovskite multiple quantum wells (MQWs) have garnered attention on account of their good stability in comparison with three-dimensional analogs for light-emitting diode (LED) applications, but they exhibit a declined photoluminescence quantum yield (PLQY) for the backlight display technology. Herein, we report an in situ process by introducing layered materials as substrates to prepare the perovskite MQW powder and utilize hexagonal boron nitride (h-BN) as an example to investigate the luminescence characteristics and mechanism of h-BN@(PMA)2MAn–1PbnBr3n+1 (h-BN@PMPB). Remarkably, the deposition strategy enables an enhanced PLQY from 2.6 to 32.4%. A synergetic effect of low reabsorption, low defect concentration, and high absorptivity leads to high-efficiency cascade energy transfer and also an improvement in stability. Moreover, the h-BN@PMPB composite powder shows a narrow-band green emission band peaking at 532 nm with a full width at half maximum of 32 nm, and the white LED backlight reaches a wide color gamut 106.1% of the National Television Standards Committee (NTSC). This work reveals a general synthesis method for preparing perovskite powder and paves the way to achieve new solid-state luminescent materials with controlled size and morphology for backlight display applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）