多孔玻璃粉原位生长高纯绿色发光CsPbBr_(3)量子点  

In-situ Growth of Green-Emissive CsPbBr_(3) Quantum Dots with High Color Purity in Porous Glass Powder

作　　者：林航[1] 吕雪杰 高鹏 王元生[1] LIN Hang;LV Xuejie;GAO Peng;WANG Yuansheng(Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China)

机构地区：[1]中国科学院福建物质结构研究所,中国科学院光电材料化学与物理院重点实验室,福州350002

出　　处：《硅酸盐学报》2024年第8期2615-2622,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51972303,52372161,U2005213,11974350)。

摘　　要：钙钛矿量子点玻璃兼具量子点优异的发光特性和玻璃的物化稳定性,受到广泛关注,但其制备过程中存在组分挥发严重、晶粒尺寸和分布难以调控等问题,实验重复性往往较差。本工作中,以多孔玻璃为模板,基于原位生长的方法,制备了CsPbBr_(3)量子点-多孔玻璃(简称为CPB-PG)复合材料。由于量子点生长受限于多孔玻璃的孔道,因此复合材料的组分/结构具有较好的可控性。改变多孔玻璃的热处理分相、酸浸析和碱洗工艺条件,可调控CPB-PG中析出的CsPbBr_(3)量子点的粒径分布。多孔玻璃粉浸渍于卤化物盐溶液时,Cs^(+)、Pb^(2+)、Br^(–)会吸附于孔道中;烘干溶剂后,CsPbBr_(3)析出;升温至CsPbBr_(3)熔点温度之上煅烧时,CsPbBr_(3)熔融,并在降温过程中于玻璃孔道中原位重结晶。光谱测试分析表明,随着量子点尺寸增大,样品发射峰红移;晶体缺陷有所增加,相应荧光量子效率下降;制得CPB-PG的半峰宽最窄仅为18 nm,实现了对于宽色域背光显示至关重要的高纯绿光发射(色坐标接近Rec.2020标准)。耦合绿光CPB-PG、红光K_(0.42)Cs_(0.58)Pb(Br_(1.5)I_(1.5))量子点玻璃粉、以及InGaN蓝光芯片,构建白光发光二极管(LED)原型器件;在20 mA电流驱动下,白光LED的光效30 lm/W,色温7710 K,显色指数75.8,可以覆盖约96%的Rec.2020标准色域。Due to high fluorescence quantum efficiency(PLQY)and narrow half-peak full width(FWHM),all-inorganic CsPbBr_(3) perovskite quantum dots are considered to be ideal green light conversion materials for use in white light emitting diode(w-LED)backlight display sources.Perovskite quantum dots glass,possessing excellent luminescence properties of quantum dots and physical/chemical stability of glass,has attracted wide attention.However,during its preparation process,serious component volatilization would occur since the melting temperature of Cs-Pb-X glass is as high as 1000℃,and it is difficult to control grain size and distribution;therefore,the experimental repeatability becomes a problem.The currently reported CsPbBr_(3) quantum dot glass is still difficult to achieve a peak wavelength close to the Rec.2020 standard of 525-535 nm high-purity green narrow band luminescence.In this work,based on an in-situ growth method,CsPbBr_(3) quantum dots-porous glass composite(CPB-PG for short)was prepared by using porous glass as template.Since the growth of quantum dot is limited by the pore channels of the PG,the composition/structure of the composite material has good controllability.Varying the process conditions of heat treatment for phase separation,acid leaching and alkali washing,the pore size distribution of CsPbBr_(3) quantum dots in CPB-PG can be manipulated.The maximum full width at half maxima(FWHM)of CPB-PG is merely 18 nm,enabling ultra-pure green light emission that is essential for wide-gamut backlight display(the color coordinates get close to the Rec.2020 standard).A white light-emitting diode(LED)prototype device was constructed by coupling green CPB-PG,red K_(0.42)Cs_(0.58)Pb(Br_(1.5)I_(1.5))quantum dot glass powders and InGaN blue chip;upon driven at 20 mA current,the device yields white light with luminous efficacy of 30 lm/W,correlated color temperature of 7 710 K,color rendering index of 75.8,and covering 96%color gamut under the Rec.2020 standard.Methods The composition of the parent glass is 69SiO

关 键 词：钙钛矿量子点 玻璃陶瓷 晶化 白光发光二极管 发光 

分 类 号：TB332[一般工业技术—材料科学与工程]