Download file (18.3MB)
Download as zip (17.1MB)

コレクション

引用

説明:

Nitrides and oxynitrides isostructural to α-Si3N4 (M-α-SiAlON, M = Sr, Ca, Li) possess
superb thermally stable photoluminescence (PL) properties, making them reliable
phosphors for high-power solid-state lighting. However, the synthesis of phase-pure Sr-αSiAlON still remains a great challenge and has only been reported for Sr below 1.35 at.%
as the large size of Sr2+ ions tends to destabilize the α-SiAlON structure. Here, we
succeeded to synthesize the single-phase powders of a unique “Sr-rich” polytypoid αSiAlON (Sr3Si24Al6N40:Eu2+) phosphor with three distinctive Sr/Eu luminescence sites
using a solid-state remixing-reannealing process. The Sr content of this polytypoid structure
exceeds those of a few previously reported structures by over 200%. The phase purity,
composition, structure, and PL properties of this phosphor were investigated. A single phase can be obtained by firing the stoichiometric mixtures of all-nitride precursors at
2050 °C under a 0.92 MPa N2 atmosphere. The Sr3Si24Al6N40:Eu2+ shows an intense
orange-yellow emission, with the emission maximum of 590 nm and internal/external
quantum efficiency of 66%/52% under 400 nm excitation. It also has a quite small thermal
quenching, maintaining 93% emission intensity at 150 °C. In comparison to Ca-αSiAlON:Eu2+, this Sr counterpart shows superior quantum efficiency and thermal stability,
enabling it to be an interesting orange-yellow down-conversion luminescent material for
white LEDs.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: phosphors, nitrides, photoluminescence, powder synthesis, White light emitting diodes

刊行年月日: 2024-12-31

出版者: Taylor & Francis

掲載誌:

• SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS (ISSN: 14686996) vol. 25 issue. 1 p. 1-19 2396276

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1080/14686996.2024.2396276

関連資料:

その他の識別子:

連絡先:

更新時刻: 2024-09-25 16:30:35 +0900

MDRでの公開時刻: 2024-09-25 16:30:35 +0900