Efficient Broadband Near-Infrared CaMgGe2O6:Cr3+ Phosphor for pc-LED

Limin Fang; Liangliang Zhang; Hao Wu; Huajun Wu; Guohui Pan; Zhendong Hao; Feng Liu; Jiahua Zhang

doi:10.1021/acs.inorgchem.2c00798

Efficient Broadband Near-Infrared CaMgGe₂O₆:Cr³⁺ Phosphor for pc-LED

Inorg Chem. 2022 Jun 13;61(23):8815-8822. doi: 10.1021/acs.inorgchem.2c00798. Epub 2022 Jun 1.

Authors

Limin Fang^{1

2}, Liangliang Zhang¹, Hao Wu¹, Huajun Wu¹, Guohui Pan¹, Zhendong Hao¹, Feng Liu³, Jiahua Zhang^{1

2}

Affiliations

¹ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China.
² Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
³ Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China.

PMID: 35649162
DOI: 10.1021/acs.inorgchem.2c00798

Abstract

Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are essential to integrate near-infrared spectrometers into mobile devices for the rapid and noninvasive detection of biological components. However, efficient broadband NIR phosphors with a peak emission wavelength longer than 800 nm are deficient. In this study, CaMgGe₂O₆:Cr³⁺ phosphor was prepared by a high-temperature solid-state reaction. The phosphor doped with 0.02Cr³⁺ showed an emission band at 845 nm with a broad bandwidth of 160 nm and a high quantum yield of 84% under 450 nm excitation. The broadband NIR pc-LED was fabricated using CaMgGe₂O₆:0.02Cr³⁺ phosphor based on a blue light-emitting diode (LED) chip. A photoelectric efficiency of 27.2% @ 10 mA and an NIR output power of 57.98 mW @ 100 mA were achieved, which are the highest values reported yet for broadband NIR pc-LEDs with a peak wavelength longer than 800 nm. Using the fabricated NIR pc-LED as the light source, the characteristic absorption spectra of some substances were obtained. All of the results indicated that the CaMgGe₂O₆:Cr³⁺ phosphor has considerable potential in near-infrared spectroscopic applications.