Luminescent properties of the Sr8−Ba MgY(PO4)7:Eu2+ solid solution
Luminescent properties of the Sr8−Ba MgY(PO4)7:Eu2+ solid solution
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DOI：
10.1016/j.omx.2023.100257
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发表时间：
2023-08
影响因子：
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通讯作者：
Nakyung Lee;M. Sójka;Jakoah Brgoch
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文献类型：
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作者：
Nakyung Lee;M. Sójka;Jakoah Brgoch
通过在晶体主体材料内的多个晶体学上独立的阳离子位点上取代稀土离子而产生的光致发光是用于产生全光谱磷光体转换的白色发光二极管（pc-wLED）的最常见方法之一。本文采用高温固相法合成了一系列组成为（Sr 8 −xBax）0.99Eu 0.08MgY（PO 4）7（x= 0，1，2，3）的复合磷酸盐。这些材料具有五个潜在的取代位点，通过多位点取代实现宽带（5905 cm−1）黄色光致发光，显示出近50%的紫激发光致发光量子产率。开发这种有效的宽发射光谱对于增强pc-wLED的显色能力至关重要。改变Sr ~（2+）和Ba ~（2+）的掺杂，在紫外光激发下（λex= 400 nm），发光颜色从黄绿色变为黄色，同时影响半高宽（fwhm）。温度依赖的光致发光测量表明，磷光体具有良好的热稳定性，在420 K下，T50是发射强度为低温强度的一半的温度，并且具有稳定的色坐标，进一步支持（Sr 8 −xBax）0.99Eu0.08MgY（PO 4）7系列是LED白色照明的有希望的候选者。使用（Sr7 Ba）0.99Eu0.08MgY（PO 4）7（最高量子产率磷光体）构建原型pc-wLED装置产生具有90的显色指数（CRI）的功能性日光灯泡。
Photoluminescence generated by substituting rare-earth ions on multiple crystallographically independent cation sites within a crystalline host material is one of the most common approaches for creating a full-spectrum phosphor-converted white light-emitting diode (pc-wLED). In this work, a series of complex orthophosphates with the composition (Sr8−xBax)0.99Eu0.08MgY(PO4)7(x= 0, 1, 2, 3) were synthesized via high-temperature solid-state synthesis. These materials possess five potential substitution sites achieving broadband (5905 cm−1) yellow photoluminescence through multi-site substitution showing a violet-excited photoluminescent quantum yield of nearly 50%. Developing such an efficient broad emission spectrum is crucial for enhancing the color rendering ability of pc-wLEDs. Varying the Sr2+to Ba2+shifts the emission color from green-yellow to yellow under violet excitation (λex= 400 nm) while influencing the full-width-at-half-maximum (fwhm). Temperature-dependent photoluminescence measurements indicate that phosphor has good thermal stability withT50, the temperature at which the emission intensity is half of the low-temperature intensity, at 420 K and stable chromaticity coordinates, further supporting that the (Sr8−xBax)0.99Eu0.08MgY(PO4)7series are promising candidates for LED white lighting. Constructing a prototype pc-wLEDs device using (Sr7Ba)0.99Eu0.08MgY(PO4)7, the highest quantum yield phosphor, produced a functional daylight bulb with a color rendering index (CRI) of 90.