Insight into the preparation and luminescence properties of yellow-green-emitting [(Sr,Ba)3AlO4F–Sr3SiO5]:Ce3+ solid solution phosphors
Insight into the preparation and luminescence properties of yellow-green-emitting [(Sr,Ba)3AlO4F–Sr3SiO5]:Ce3+ solid solution phosphors
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DOI：
10.1039/c7tc00630f
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发表时间：
2017-03
影响因子：
6.4
通讯作者：
Zhen Yu;Z. Xia;Mingyue Chen;Qianchuan Xiang;Quanlin Liu
中科院分区：
文献类型：
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作者：
Zhen Yu;Z. Xia;Mingyue Chen;Qianchuan Xiang;Quanlin Liu
采用[Al 3 +-F−]取代[Si 4 +-O2−]的化学单元设计原理，建立了（Sr，Ba）3SiO 5和（Sr，Ba）3AlO 4F的同构相关系，并采用“一步法”和“两步法”制备了发光性能可调的（1 − x）Sr 3SiO 5-x（Sr，Ba）3AlO 4F：Ce 3+固溶体.研究了（1 − x）Sr 3SiO 5-x（Sr，Ba）3AlO 4F：Ce 3+荧光粉的结构和光致发光调谐，发现采用两步法可以获得高结晶质量的增强的发光强度。随着掺杂量从x = 0增加到x = 1.0，（1-x）Sr 3SiO 5-x（Sr，Ba）3AlO 4F：Ce 3+荧光粉的发射峰从520 nm蓝移到490 nm，并对相应的机理进行了讨论。温度相关发光特性的研究结果进一步验证了固溶体的形成可以提高光致发光的热稳定性。基于所制备的蓝黄发光磷光体和商业红色磷光体，与415 nm NUV发光InGaN芯片组合，制造了白色发光二极管（w-LED）灯。最佳封装的w-LED灯给出CIE色度坐标为（0.38，0.42），暖色温度为4277 K，显色指数为86.3。
A design principle for the chemical unit cosubstitution of [Al3+–F−] for [Si4+–O2−] has been adopted to establish the phase relations between isostructural (Sr,Ba)3SiO5 and (Sr,Ba)3AlO4F, and solid solutions of (1 − x)Sr3SiO5–x(Sr,Ba)3AlO4F:Ce3+ with tunable luminescence properties have been prepared based on the comparative “one-step” and “two-step” methods. The structures and photoluminescence tuning of the (1 − x)Sr3SiO5–x(Sr,Ba)3AlO4F:Ce3+ phosphors were investigated, and it was found that enhanced emission intensities could be obtained using the two-step method with high crystalline quality. The emission peaks of the (1 − x)Sr3SiO5–x(Sr,Ba)3AlO4F:Ce3+ phosphors were blue-shifted from 520 to 490 nm upon increasing the content from x = 0 to x = 1.0, and the corresponding mechanism has been discussed. The results of the temperature-dependent luminescence properties further verified that the formation of a solid solution can improve the thermal stability of the photoluminescence. White light-emitting diode (w-LED) lamps were fabricated based on the as-prepared bluish-yellow emitting phosphors, and commercial red phosphors, combined with 415 nm NUV-emitting InGaN chips. The best packaged w-LED lamp gave CIE chromaticity coordinates of (0.38, 0.42) with a warm color temperature of 4277 K and a color rendering index of 86.3.