About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
14th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing
|
Presentation Title |
L-7: Fabrication of Blue-light Emitted and Transparent Lu-α-SiAlON:Ce3+ Ceramics |
Author(s) |
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi |
On-Site Speaker (Planned) |
Kohei Aminaka |
Abstract Scope |
α-SiAlON, which has excellent thermal and mechanical properties, is a phosphor that emits tunable blue light because of the doping of Ce3+. However, only a few α-SiAlON ceramics with photoluminescence properties corresponding to Ce3+ and high transparency have been developed. In this study, we fabricated blue-light emitted and transparent α-SiAlON:Ce3+ ceramics using a gas-pressure sintering technique utilizing Lu3+, which has the smallest ionic radius among the stabilizable rare-earth ions of α-SiAlON. The Lu-α-SiAlON:Ce3+ ceramics exhibited higher transparency than Y-α-SiAlON:Ce3+ because of the finer grain size. The maximum emission wavelength of the Lu-α-SiAlON:Ce3+ ceramics was blue-shifted in relation to that of the Y-α-SiAlON:Ce3+ ceramics, owing to lattice shrinkage. The lower Ce concentration resulted in higher transparency and a blue-shift of the maximum emission wavelength. Furthermore, the in-line transmittance of the gas-pressure sintered Lu-α-SiAlON:Ce3+ ceramics using fine raw powders of rare-earth oxides was 50% at 600 nm. |