Preparation and Luminescence Spectra of Calcium- and Rare-Earth (R = Eu, Tb, and Pr)-Codoped α-SiAlON Ceramics
Preparation and Luminescence Spectra of Calcium- and Rare-Earth (R = Eu, Tb, and Pr)-Codoped α-SiAlON Ceramics
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DOI：
10.1111/j.1151-2916.2002.tb00250.x
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发表时间：
2004-12
影响因子：
3.9
通讯作者：
R. Xie;M. Mitomo;K. Uheda;Fangfang Xu;Y. Akimune
中科院分区：
文献类型：
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作者：
R. Xie;M. Mitomo;K. Uheda;Fangfang Xu;Y. Akimune
据报道，稀土掺杂的氮氧化物或氮化物化合物是发光的，并且可以用作具有良好的热稳定性和化学稳定性的新磷光体。本文报道了掺铕、铽和镨的Ca-α-SiAlON陶瓷的光致发光谱。通过在氮气气氛中在20 MPa下在1750°C下热压lh来制备高度致密的陶瓷。Eu掺杂的Ca-α-SiAlON在550-590 nm范围内呈现单一的宽发射带，其峰值随Eu掺杂浓度的变化而变化。Eu 3+掺杂Ca-α-SiAlONs光谱中的发射带归属于Eu 2+从最低晶场4f 65 d到8 S7/2（4f 7）基态能级的允许跃迁。Tb和Pr掺杂Ca α SiAlON陶瓷的发射光谱均由多条尖锐的谱线组成，分别归属于Tb 3+的5D4 → 7 Fj（j = 3，4，5，6）和Pr 3+的3 Po → 3 Hj（j = 3，4，5）跃迁。特别是掺铽的α-SiAlON陶瓷在这些荧光粉中表现出较强的绿色发光。
Rare-earth-doped oxynitride or nitride compounds have been reported to be luminescent and may then serve as new phosphors with good thermal and chemical stabilities. In this work, we report the photoluminescence (PL) spectra of europium-, terbium-, and praseodymium-doped Ca-α-SiAlON ceramics. The highly dense ceramics were prepared by hot pressing at 1750°C for 1 h under 20 MPa in a nitrogen atmosphere. Europium-doped Ca-α-SiAlON displayed a single broad emission band peaking at λ = 550-590 nm depending on the europium concentration. The emission bands in the spectra of europium-doped Ca-α-SiAlONs were assigned to the allowed transition of Eu 2+ from the lowest crystal field component of 4f 6 5d to 8 S 7/2 (4f 7 ) ground-state level. The emission spectra of terbium- and praseodymium-doped Ca-α-SiAlON ceramics both consisted of several sharp lines, which were attributed to the 5 D 4 → 7 F j (j = 3, 4, 5, 6) transitions of Tb 3+ and 3 P o → 3 H j (j = 3, 4, 5) transitions of Pr 3+ , respectively. In particular, the terbium-doped α-SiAlON ceramics showed a strong green emission among these phosphors.