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Green and red phosphor for LED backlight in wide color gamut LCD

Journal of Rare Earths 2020年第1期38卷 1-12页

作者： Yunpeng Zhang Lin Luo Guantong Chen Yuanhong Liu Ronghui Liu Xiaochun Chen Beijing University of Chemical Technology Beijing 100029China National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co.Ltd.Beijing 100088China

wide color gamut(WCG) backlight for liquid crystal display(LCD) utilizing white light-emitting diodes(LED) has attracted considerable attention for their high efficiency and color *** this review,recent developments in crystal structure,luminescence and applications of phosphors for wide color gamut LED backlight are *** novel red phosphors,Mn4+activate fluoride and aluminate phosphors are advanced in quantum efficiency,thermal quenching and color saturation for their characteristic spectrum with broad excitation band and linear *** crystal structure and fluorescence properties of Mn4+doped fluosilicate,fluorogermanate,fluotitanate,as well as Sr4 Al14O25,CaAl12O19 and BaMgAl10O17 phosphors are discussed in detail.A serial of narrow-band red-emitting Eu2+,Eu3+and Pr3+-doped nitride silicates and molybdate phosphors are also ***-earth-doped oxynitride and silicate green-emitting phosphors have attracted more and more attention because of the wide excitation,narrow emission,high quenching temperature,high quantum efficiency,such as β-sialon:Eu2+,Ba3Si6O12N2:Eu2+,MSi2O2N2:Eu2+(M=Ca,Sr,Ba),y-AlON:Mn2+and Ca3Sc2Si3O12:Ce3+.All above phosphors demonstrate their adaptability in wide color gamut LCD *** for Mn4+doped fluosilicate red phosphor and β-sialon:Eu2+green *** achieve an ultra-high color gamut in white LED backlight and against the OLED,innovative narrow-band-emission red and green phosphor materials with independent intellectual property rights are continuously pursed.

关键词： wide color gamut Backlight Liquid crystal display Phosphor White LED Rare earths

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Narrow-band high-transmittance birefringent filter and its application in wide color gamut display

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Chinese Physics B 2021年第5期30卷 401-405页

作者： Chi Zhang Rui Niu Wenjuan Li Xiaoshuai Li Hongmei Ma Yubao Sun School of Electronic and Information Engineering Hebei University of TechnologyTianjin 300401China Department of Applied Physics Hebei University of TechnologyTianjin 300401China

We propose a narrow-band birefringent filter and its application in wide color *** birefringent filter consists of five phase retarders and two polarizers,and it has both narrow band and high *** the experiment,we fabricate the birefringent filter using quartz phase retarders and polarizers,and apply it in serval different *** color gamuts of displays are enhanced more than 30%NTSC(National Television System Committee),and the widest color gamuts that have been obtained are 126%NTSC in liquid crystal displays and 138%NTSC in organic light-emitting ***,the deep blue light in spectrum of display can be reduced using the birefringent *** birefringent filter can be an efficient element to achieve wide color gamut display.

关键词： narrow band filter wide color gamut display

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Stable α-CsPbI3 with extremely red emission for expanding the color gamut

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Science China(Information Sciences) 2024年第5期67卷 311-317页

作者： Yong ZHANG Xin WEI Lei GAO Weijie ZHAO Changjiu SUN Junli WEI Mingjian YUAN Zhenhua NI Junpeng LU Hongwei LIU School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Jiangsu Key Lab on Opto-Electronic Technology School of Physics and TechnologyNanjing Normal University

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, whereinα-CsPbI3 is used to generate the extreme red primary color. An in-situ encapsulation approach is advised to stabilizeα-CsPbI3 at room temperature by means of polyvinylpyrrolidone(PVP).Theα-CsPbI3 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(CsPbBr3 with PVP) which is also synthesized using the universal in-situ encapsulation approach. With the assistance of a commercial Ga N chip, the RGB gamut is extended to the widest(151% NTSC, 113%Rec.2020).

关键词： all-inorganic perovskite wide color gamut LED display carrier recombination

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Flat-Panel Laser Displays Based on Liquid Crystal Microlaser Arrays

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CCS Chemistry 2020年第6期2卷 369-375页

作者： Fa Feng Xu Yong Jun Li Yuanchao Lv Haiyun Dong Xianqing Lin Kang Wang Jiannian Yao Yong Sheng Zhao Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049

Laser displays,benefiting from the characteristic merits of lasers,have led to the revolution of next-generation display technologies owing to their superior color ***,the acquisition of pixelated laser arrays as self-emissive panels for flat-panel laser displays remains *** crystal(LC)materials with excellent processability and optoelectronic properties offer considerable potential for the construction of highly ordered multicolor laser ***,we demonstrate flat-panel laser displays on LC microlaser pixel arrays through a microtemplate-assisted inkjet printing *** organic red-green-blue(RGB)microlaser pixel arrays were obtained by doping dyes into LCs with photonic band edges to obtain single-mode RGB lasing,leading to a much broader color gamut,compared with the standard RGB color *** we acquired periodically patterned RGB pixel matrices by positioning LC microlasers precisely into highly ordered arrays,according to the well-organized geometry of the ***,we demonstrated full-color flat-panel laser displays using the LC microlaser pixel matrices as self-emissive *** results provide valuable enlightenment for the construction of next-generation flat-panel laser display devices.

关键词： laser display liquid crystal laser laser array full-color laser single-mode laser wide color gamut

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