Preparation and Photo luminescent Properties of Sr2Si5N8: Eu2+Red Phosphors for White Light-Emitting Diodes

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Yu, Zhibin^1 ; Man, Shiqing^1 ; He, Pan^1 ; Zhang, Ning^1 ; Gu, Ciyong^1

Yunnan Key Laboratory for Optoelectronic Information Technology, School of Physics and Electronic Information, Yunnan Normal University, Kunming

650500, China^1

关键词: Emission spectrums;    Excitation spectrum;    Fluorescence spectrophotometer;    Photo-luminescent properties;    Reduction agents;    Reduction and nitridation;    White light emitting diodes;    White lightemitting diodes (WLEDs);   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/4/042114/pdf
DOI  :  10.1088/1755-1315/170/4/042114

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper study a simple, inexpensive synthetic route to Sr2Si5N8:Eu2+ based red nitride phosphors for white light-emitting diodes (WLEDs). The Eu2+ doped Sr2Si5N8 nitride phosphor were synthesized by carbothermal reduction and nitridation method using SrCO3, Si3N4 and Eu2O3 as raw materials, and carbon as main reduction agent. Sr2Si5N8:Eu2+ phosphors was obtained at 1600°C under N2 atmosphere. Sr2Si5N8:Eu2+ phosphors structure were investigated using X-ray diffraction (XRD); the phosphors excitation spectrum, emission spectrum and decay lifetime were obtained by fluorescence spectrophotometer. Excitation spectrum of Sr2Si5N8:Eu2+ phosphors showed a broad excitation bands peaking at 632 nm by both UV and blue light. There is an asymmetric wide emission peaks between 500 nm and 750 nm originated from the 4f65d1-4f7 transitions of Eu2+ ion. And the lifetime of Eu2+ in the Sr2Si5N8 host is 1919.81 ns. The CIE chromaticity coordinates of Sr2Si5N8:Eu2+ phosphors are (x=0.5549, y=0.4316).