Emission tunable of Mg0.695Si0.695Al1.39O3.65N0.35∶Eu2+,Mn2+oxynitride phosphors via energy transfer for WLEDs

• 作者: Yijun Yu Yi Chen Liang Chen Yuyu Shen Xiao Liu Degang Deng Shiqing Xu
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 643-650
• 页数: 8页
• 语种: 英文

摘要

A series of Eu2+ doped and Eu2+/Mn2+ co-doped Mg0.695Si0.695Al1.39O3.65N0.35 (MSAON) phosphors were synthesized by solid-state reaction at a lower temperature of 1500 ℃.The crystal morphology and structure of MSAON host were characterized by SEM,TEM and XRD.The quantum yield (QY) for Eu2+doped MSAON phosphors was measured as high as 62％,indicating the excellent luminous efficiency.For the Eu2+/Mn2+ co-doped MSAON phosphor,the photoluminescence spectrum and delay curves reveal the efficient energy transfer (ET) process from Eu2+ to Mn2+ ions.Meanwhile,the corresponding energy transfer efficiency,critical distance and mechanism are discussed in detail.Temperature-dependent emission spectrum shows the thermal and color stabilities.The emission color of MSAON∶Eu2+,Mn2+phosphors could be tuned from blue through white to red via varying the concentration of Mn2+ ions.White-light-emitting diodes (WLEDs) were successfully fabricated by encapsulating the phosphors in n-UV LED (365 nm) devices obtaining white light with color rendering index (CRI) as high as 87.7.The results reveal that the MSAON∶Eu2+,Mn2+ phosphors could have potential application in the field of n-UV WLEDs.