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Efficient Broadband Near-Infrared CaMgGe 2 O 6 :Cr 3+ Phosphor for pc-LED.

Limin FangLiangliang ZhangHao WuHuajun WuGuohui PanZhendong HaoFeng LiuJiahua Zhang
Published in: Inorganic chemistry (2022)
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, CaMgGe 2 O 6 :Cr 3+ phosphor was prepared by a high-temperature solid-state reaction. The phosphor doped with 0.02Cr 3+ 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 CaMgGe 2 O 6 :0.02Cr 3+ 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 CaMgGe 2 O 6 :Cr 3+ phosphor has considerable potential in near-infrared spectroscopic applications.
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