S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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S&M2611 Research Paper of Special Issue

Near-infrared Phosphors: Photophysical Properties of Calcium-doped YSGG:Cr4+

Takayuki Nakanishi, Makoto Tsurui, Jian Xu, Nao Takahashi, Takashi Takeda, and Naoto Hirosaki

(Received January 30, 2021; Accepted May 10, 2021)

Keywords: garnet, near-infrared, chromium, luminescence

Toward developing super-broadband LEDs using NIR phosphors, the effect of Ca substitution on the luminescence of Cr-doped Y3Sc2Ga3O12 garnet (YSGG) was evaluated. The valence of chromium ions in YSGG mainly takes two states, trivalent and tetravalent, and YSGG shows luminescence peaks at 740 nm (Cr3+) in octahedral Sc sites and at 1530 nm (Cr4+) in distorted tetrahedral Ga sites. The garnet host is very suitable for optical-sensing LED applications because these two emission bands closely match two NIR windows, NIR-I (600–950 nm) and NIR-III (1500–1800 nm), which are applied for bio-imaging. In this study, we demonstrated that the Cr4+ broad emission was improved by Ca substitution to control the photophysical properties. We concluded that YSGG:Cr4+ with D2d symmetry in a unique distorted tetrahedron is a promising NIR phosphor for light-emitting applications.

Corresponding author: Takayuki Nakanishi

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