光致发光
荧光粉
分析化学(期刊)
发光
材料科学
X射线光电子能谱
量子产额
兴奋剂
发射光谱
光致发光激发
化学
光电子学
光学
谱线
荧光
核磁共振
物理
色谱法
天文
作者
Yasushi Nanai,Yohei Satake,Nobuaki Kitazawa
标识
DOI:10.35848/1347-4065/ad1e87
摘要
Abstract Herein, we report the photoluminescence (PL) properties of Cr 3+ -doped Mg 4 Nb 2 O 9 phosphors for applications in NIR phosphor-converted LEDs. Trigonal Mg 4 Nb 2 O 9 crystals with Cr 3+ substitution at three sites were synthesized as the main phase using a solid-state reaction. X-ray photoelectron spectrometry and diffuse reflectance spectroscopy indicated that only trivalent chromium ions were present in the samples. Broadband NIR emission of Cr 3+ suitable for combination with Si photodetectors was confirmed at approximately 850 nm. The maximum PL quantum yield (PLQY) was 0.62, and concentration quenching explained the Cr concentration dependence of the PLQY and PL decay time. Low-temperature PL measurements suggested that the PL spectrum comprised three distinct emission bands. The results of the phonon line simulation, low-temperature photoluminescence excitation measurements, and crystal-field parameter estimation clarified the correlation between these emission bands and the Cr 3+ substitution sites.
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