Fang Limin, Zhang Liangliang, Wu Hao, Wu Huajun, Pan Guohui, Hao Zhendong, Liu Feng, Zhang Jiahua
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China.
Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
Inorg Chem. 2022 Jun 13;61(23):8815-8822. doi: 10.1021/acs.inorgchem.2c00798. Epub 2022 Jun 1.
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, CaMgGeO:Cr phosphor was prepared by a high-temperature solid-state reaction. The phosphor doped with 0.02Cr 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 CaMgGeO:0.02Cr 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 CaMgGeO:Cr phosphor has considerable potential in near-infrared spectroscopic applications.
宽带近红外（NIR）磷光转换发光二极管（pc-LED）对于将近红外光谱仪集成到移动设备中以快速、无创地检测生物成分至关重要。然而，峰值发射波长大于800 nm的高效宽带近红外磷光体却很匮乏。在本研究中，通过高温固态反应制备了CaMgGeO:Cr磷光体。掺杂0.02Cr的磷光体在450 nm激发下，在845 nm处呈现发射带，带宽为160 nm，量子产率高达84%。基于蓝光发光二极管（LED）芯片，使用CaMgGeO:0.02Cr磷光体制备了宽带近红外pc-LED。在10 mA时实现了27.2%的光电效率，在100 mA时实现了57.98 mW的近红外输出功率，这是迄今报道的峰值波长大于800 nm的宽带近红外pc-LED的最高值。以制备的近红外pc-LED作为光源，获得了一些物质的特征吸收光谱。所有结果表明，CaMgGeO:Cr磷光体在近红外光谱应用中具有相当大的潜力。
