白光LED用K_(2)TaF_(7)∶Mn^(4+)红色发光晶体发光性能研究  

Luminescence of red-emitting K_(2)TaF_(7)∶Mn^(4+) crystals for white light-emitting diodes

作　　者：汪正良 李童 袁俊恒 WANG Zheng-liang;LI Tong;YUAN Jun-heng(Key Laboratory of Green-Chemistry Materials in University of Yunnan Province,School of Chemistry&Environment,Yunnan Minzu University,Kunming,650500,China)

机构地区：[1]云南民族大学化学与环境学院,云南省高校绿色化学材料重点实验室,云南昆明650500

出　　处：《云南民族大学学报（自然科学版）》2021年第5期488-492,499,共6页Journal of Yunnan Minzu University:Natural Sciences Edition

基　　金：国家自然科学基金(21661033);国家自然科学基金-云南省联合项目(U1702254).

摘　　要：通过溶剂挥发法生长出红色棒状K_(2)TaF_(7)∶Mn^(4+)发光晶体,通过X线单晶衍射确定其晶体结构及相关晶胞参数.通过对样品的发光性能研究,样品最强激发带位于466 nm左右的蓝光区,半峰宽约为70 nm;最强发射位于628 nm处.当n Mn^(4+)∶n K_(2)TaF_(7)为35%时所得晶体的红光发射最强,外量子效率高达49.2%.将K_(2)TaF_(7)∶Mn^(4+)发光晶体、YAG∶Ce^(3+)黄色荧光粉和蓝光GaN芯片组装成暖白光LED,所得器件具有优异的光电性能.Herein,red-emitting rod-like crystals K_(2)TaF_(7)∶Mn^(4+)were successfully prepared by vaporing the solvent.Its crystal structure and cell parameters were confirmed by the single-crystal X-ray diffraction.The grown crystals exhibit one intense broad excitation band peaking at 466 nm with a full width at half maximum(FWHM)of 70 nm and red emission with the strongest peak at 628 nm.The K_(2)TaF_(7)∶Mn^(4+)crystal prepared with the Mn^(4+)content of 35 mol%exhibits the strongest emission intensity and the highest external quantum efficiency of 49.2%.At last,one white light-emitting diode with excellent performance was fabricated by combining K_(2)TaF_(7):Mn^(4+)crystal,YAG∶Ce^(3+),and one GaN chip.

关 键 词：红光晶体 氟化物 发光性能 白光LED 

分 类 号：O482.31[理学—固体物理]