Thermally Stable CaLu2Mg2Si3O12:Cr3+ Phosphors for NIR LEDs. Issue 16 (22nd May 2021)

• Record Type: Journal Article
• Authors: Li, Ruiyang; Liu, Yongfu; Yuan, Chenxu; Leniec, Grzegorz; Miao, Lijing; Sun, Peng; Liu, Zehua; Luo, Zhaohua; Dong, Rui; Jiang, Jun
• Is Part Of: Advanced optical materials. Volume 9:Issue 16(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-22
• Subjects: CaLu 2Mg 2Si 3O 12:Cr 3+ -- garnets -- near‐infrared phosphor -- NIR‐LED device -- night vision; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202100388
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Near‐infrared (NIR) phosphor‐converted (pc) light‐emitting diode (LED) is a promising next‐generation tiny light source for smart and broadband NIR spectroscopy technology. However, NIR phosphors suffer from challenges in terms of low efficiency and thermal stability. Herein, by selecting a host with large bandgap and weakening the coupling effect to Cr 3+, the novel CaLu2 Mg2 Si3 O12 :Cr 3+ (CLMSG:Cr 3+ ) NIR phosphor is discovered that has an external quantum efficiency of 20.7% and high thermal stability (92.1%@100 °C). Under ≈450 nm excitation, CLMSG:Cr 3+ shows broad NIR emission from 650 to 900 nm with a band width of ≈120 nm. The fabricated tiny pcLED demonstrates bright NIR light (34.75 mW@100 mA) with photoelectric efficiency of 11.6%. Abstract : By selecting the CaLu2 Mg2 Si3 O12 (CLMSG) host that has a large bandgap and weakening the coupling effect of Cr 3+ to the host, good thermal stability (92.1%@100 °C) can be achieved in garnets. The fabricated near‐infrared phosphor‐converted light‐emitting diode (NIR pcLED) device combining the CLMSG:Cr 3+ phosphor and blue LED chips emits bright NIR radiation, demonstrating application in night vision technology.