Design of luminescence in(Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+)deep red phosphors via crystal field engineering for full-spectrum WLEDs

作     者：Qing Lin Tongyu Gao Yuanhong Liu Ronghui Liu Siwei Chen Xiaole Ma Chunlei Zhao Qing Lin;Tongyu Gao;Yuanhong Liu;Ronghui Liu;Siwei Chen;Xiaole Ma;Chunlei Zhao

作者机构：National Engineering Research Center for Rare EarthGRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co.Ltd.Beijing 100088China General Research Institute for Nonferrous MetalsBeijing 100088China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2023年第41卷第8期

页      面：1127-1134,I0001页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0803[工学-光学工程] 

基　　金：supported by the National Key Research and Development Program of China(2021YFB3500402) 

主　　题：Full-spectrum WLEDs Structural modulation Deep red phosphor Rare earths 

摘      要：Red phosphor,with longer wavelength,is highly desirable for full-spectrum *** deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural *** correlations among structural evolution,crystal-field environment,and luminescence properties were *** Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and *** further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and *** above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.