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Emission tunable of Mg0.695Si0.695Al1.39O3.65N0.35:Eu2+,Mn2+ oxynitride phosphors via energy transfer for WLEDs
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jre.2020.06.021
Yijun Yu , Yi Chen , Liang Chen , Yuyu Shen , Xiao Liu , Degang Deng , Shiqing Xu

Abstract 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 °C. The crystal morphology and structure of MSAON host was characterized by SEM, TEM and XRD. The quantum yield (QY) for Eu2+ doped MSAON phosphors were 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.

中文翻译:

Mg0.695Si0.695Al1.39O3.65N0.35:Eu2+,Mn2+ 氮氧化物荧光粉通过能量转移实现 WLED 的发射可调

摘要 通过固相反应在1500 ℃的较低温度下合成了一系列Eu2+掺杂和Eu2+/Mn2+共掺杂的Mg0.695Si0.695Al1.39O3.65N0.35(MSAON)荧光粉。通过SEM、TEM和XRD对MSAON主体的晶体形貌和结构进行了表征。Eu2+ 掺杂的 MSAON 荧光粉的量子产率 (QY) 高达 62%,表明其具有出色的发光效率。对于 Eu2+/Mn2+ 共掺杂 MSAON 荧光粉,光致发光光谱和延迟曲线揭示了从 Eu2+ 到 Mn2+ 离子的有效能量转移 (ET) 过程。同时,详细讨论了相应的能量传递效率、临界距离和机理。温度相关的发射光谱显示了热稳定性和颜色稳定性。MSAON的发光颜色:通过改变 Mn2+ 离子的浓度,可以将 Eu2+Mn2+ 荧光粉从蓝色调到白色再到红色。通过将荧光粉封装在 n-UV LED (365 nm) 器件中,成功制造了白光发光二极管 (WLED),获得了显色指数 (CRI) 高达 87.7 的白光。结果表明,MSAON:Eu2+Mn2+荧光粉在n-UV WLEDs领域具有潜在的应用价值。
更新日期:2020-07-01
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