Red shift properties, crystal field theory and nephelauxetic effect on Mn4+-doped SrMgAl10-yGayO17 red phosphor for plant growth LED light
Red shift properties, crystal field theory and nephelauxetic effect on Mn4+-doped SrMgAl10-yGayO17 red phosphor for plant growth LED light
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DOI：
10.1016/j.cej.2020.125208
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发表时间：
2020-09-15
影响因子：
15.1
通讯作者：
Zhou, Zhi
中科院分区：
文献类型：
--
作者：
Gu, Simin;Xia, Mao;Zhou, Zhi
由于Mn4+离子中E-2(G)-&Gt；(4)A(2)跃迁的红光发光特性，发现适合植物生长的新型Mn4+掺杂氧化物红色荧光粉是近年来的研究热点。通常情况下，由于大多数荧光粉中特定的晶场，Mn4+的发射位置很难调节。通过简单的用Ga3+取代Al3+，观察到掺Mn4+的SrMgAl10-yGaYO17红色荧光粉具有明显的光谱红移可调谐发光特性，并用晶场理论和云延伸效应对这一现象进行了解释。同时，由于G(A3)+的掺杂引导了Mn4+的置换位置，改变了发光中心，从而改变了光谱的形状。由于适当的Ga3+掺杂导致了更大的带隙，减少了非辐射跃迁，因此获得了更高的发射强度。用蓝筹(470 Nm)制作的荧光粉转换发光二极管(PC-LED)和所得到的SrMgAl10-yGaYO17：1.0%Mn4+荧光粉发出明亮的蓝光和红光，与植物色素的吸收区域很好地匹配，因此SrMgAl10-yGaO17：Mn4+荧光粉可以作为植物生长LED光的候选材料。
The discovery of novel Mn4+-doped oxide red phosphor with suitable spectrum for plant growth is a hot issue in the recent years due to the characteristic red photoluminescence of E-2(g) -> (4)A(2) transition in Mn4+ ions. Generally, the emission position of Mn4+ is hard to tune because of specific crystal field in most phosphors. In this work, tunable luminescence property with obvious red shift in the spectra is observed in the Mn4+-doped SrMgAl10-yGayO17 red phosphor via simple substitution of Ga3+ for Al3+, and crystal field theory and nephelauxetic effect are employed to explain this phenomenon. Meanwhile, the Ga3+ dopant changes the shape of the spectra because G(a3)+ dopant guides the replacement site of Mn4+ and changes the luminescence center. Improved emission intensity is obtained because appropriate Ga3+ doping leads to larger band gap and reduces non-radiative transitions. Phosphor-converted LED (pc-LED) devices fabricated with blue chip (470 nm) and the asobtained SrMgAl10-yGayO17:1.0%Mn4+ phosphors emit bright blue and red light, which fit the absorption regions of plant pigments well, thus SrMgAl10-yGayO17:Mn4+ phosphor can be a candidate for plant growth LED light.