Photoluminescence of rare-earth-doped Ca-α-sialon phosphors : Composition and concentration dependence
Photoluminescence of rare-earth-doped Ca-α-sialon phosphors : Composition and concentration dependence
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DOI：
10.1111/j.1551-2916.2005.00532.x
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发表时间：
2005-10
影响因子：
3.9
通讯作者：
R. Xie;N. Hirosaki;M. Mitomo;T. Suehiro;Xin Xu;Hidehiko Tanaka
中科院分区：
文献类型：
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作者：
R. Xie;N. Hirosaki;M. Mitomo;T. Suehiro;Xin Xu;Hidehiko Tanaka
在10 atm N2气氛下，于1700°C烧结2 h制备了稀土掺杂Ca-α-SiAlON荧光粉，其组成为（Ca 1 −3/2xREx）m/2Si 12 − m-nAlm + nOnN 16 −n（RE=Ce，Sm，Dy，0.5≤m=2n≤3.0）。稀土的浓度从3原子%到30原子%不等对于Ca。光致发光（PL）性质作为主体基质的组成（即，m）和稀土的浓度（即，x）。结果表明，通过对m和x的剪裁，可以优化发光性能。Ce ~（3+）离子4f-5d组态间跃迁的发光受周围环境的影响很大，这与Sm ~（3+）或Dy ~（3+）离子4f-4f组态内跃迁的发光不同。X射线衍射和扫描电子显微镜被用来解释的组成和浓度依赖性的PL性能。
Rare-earth-doped Ca-α-SiAlON phosphors, with the compositions of (Ca1−3/2xREx)m/2Si12−m−nAlm+nOnN16−n (RE=Ce, Sm, and Dy, 0.5≤m=2n≤3.0), were prepared by sintering at 1700°C for 2 h under 10 atm N2. The concentration of rare earths varied from 3 to 30 at.% with respect to Ca. The photoluminescence (PL) properties were investigated as functions of the composition of the host matrix (i.e., m) and the concentration of rare earths (i.e., x). The results show that the emission properties can be optimized by tailoring m and x. The Ce3+ luminescence originating from the 4f–5d interconfigurational transitions is greatly affected by the environment surrounding the Ce3+ ions, which differs from the Sm3+ or Dy3+ luminescence arising from the 4f–4f intraconfigurational transitions. X-ray diffraction and scanning electron microscopy were used to explain the composition and concentration dependence of PL properties.