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Preparation and Luminescence Spectra of Calcium‐ and Rare‐Earth (R = Eu, Tb, and Pr)‐Codoped α‐SiAlON Ceramics
Author(s) -
Xie RongJun,
Mitomo Mamoru,
Uheda Kyota,
Xu FangFang,
Akimune Yoshio
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00250.x
Subject(s) - europium , sialon , terbium , praseodymium , phosphor , photoluminescence , materials science , luminescence , doping , ceramic , emission spectrum , analytical chemistry (journal) , mineralogy , spectral line , chemistry , metallurgy , physics , optoelectronics , organic chemistry , astronomy
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 4 f 6 5 d to 8 S 7/2 (4 f 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 0 → 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.