Broadband near-infrared emission of K3ScF6:Cr3+ phosphors for night vision imaging system sources
Broadband near-infrared emission of K3ScF6:Cr3+ phosphors for night vision imaging system sources
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DOI：
10.1016/j.cej.2021.129271
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发表时间：
2021-03
影响因子：
15.1
通讯作者：
Haojun Yu;Jian Chen;Ruiyu Mi;Juyu Yang;Yan’gai Liu
中科院分区：
文献类型：
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作者：
Haojun Yu;Jian Chen;Ruiyu Mi;Juyu Yang;Yan’gai Liu
800 nm附近的宽带近红外光在食品检测和夜视监控方面具有广阔的应用前景。与近红外芯片相比，近红外荧光粉具有明显的优势，包括成本低，合成工艺成熟，可调组合。然而，目前，氧化物近红外荧光粉存在一些缺点，例如半高宽（FWHM）窄、热稳定性差和光电效率低。本文采用水热法合成了具有立方结构的K3 ScF 6：Cr 3+近红外荧光粉。这些磷光体可以被蓝光（430 nm）和红光（630 nm）有效地激发，导致从650 nm到950 nm的宽带Cr 3+发射，具有430 nm的大FWHM。它们还表现出优异的热稳定性，在150 °C下保持其初始强度的87.3%。在100 mA的驱动电流下，其光电效率可达到制造的近红外发光二极管（NIR-LED）的9.315%。因此，基于该磷光体的NIR-LED器件可以在夜视成像系统中实现。
Broadband near-infrared light (NIR) near 800 nm has broad application prospects in food detection and night vision monitoring. Compared with NIR chips, NIR phosphors have distinct advantages, including low cost, a mature synthesis process, and tunable combination. However, at present, oxide NIR phosphors have some disadvantages, such as a narrow full width at half maximum (FWHM), poor thermal stability, and low photoelectric efficiency. Herein, K3ScF6:Cr3+NIR phosphors with a cubic structure were synthesized using the hydrothermal method. These phosphors can be effectively excited by blue light (430 nm) and red light (630 nm), leading to a broadband Cr3+emission from 650 nm to 950 nm with a large FWHM of 430 nm. They also exhibit excellent thermal stability and retain 87.3% of their initial intensity at 150 °C. Under a driving current of 100 mA, their photoelectric efficiency can reach 9.315% of that of fabricated NIR light-emitting diodes (NIR-LED). An NIR-LED device based on this phosphor can thus be implemented in night vision imaging systems.