Broadband NIR Garnet Phosphors with Improved Thermal Stability via Energy Transfer

作者：Yan Liu, Shuai He, Dan Wu, Xiaoling Dong, Wenping Zhou · 发表于：ACS Applied Electronic Materials · 年份：2022 · DOI：10.1021/acsaelm.1c01029 · 被引用次数：49 · 研究领域：Luminescence Properties of Advanced Materials、Perovskite Materials and Applications、Solid State Laser Technologies

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have attracted more and more attention because of their many potential optical applications. However, high-performance broadband NIR phosphors are still rare. Here, we demonstrated that Cr 3+ -to-Yb 3+ energy transfer (ET) is an effective strategy to boost the properties of NIR luminescence materials in Ca 2 LaZr 2 Ga 2.8 Al 0.2 O 12: Cr 3+,Yb 3+ (CZGG: Cr 3+, Yb 3+ ). In addition to the enrichment of short-wave NIR emission in 900–1100 nm, the overall thermal stability of CZGG: Cr 3+, Yb 3+ can be improved by leveraging high-efficiency ET from Cr 3+ to Yb 3+, ascribed to the fast ET from Cr 3+ to its nearest Yb 3+ as well as the superior thermal stability of Yb 3+ . Additionally, an NIR pc-LED device was packaged via combining CZGG: Cr 3+, Yb 3+ with a blue LED chip to demonstrate its possible application in compact nonvisible light sources.