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.
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)
出处
《云南民族大学学报（自然科学版）》
CAS
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).
关键词
红光晶体
氟化物
发光性能
白光LED
red-emitting crystals
fluorides
luminescent properties
white light-emitting diodes
