Concepedia

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Xufeng Zhou, Wanying Geng, Junyi Li, Yichao Wang, Jianyan Ding, Yuhua Wang, Yuhua Wang

Advanced Optical Materials · 2020 · 279 citations · 42 references

TL;DR

High‑radiance near‑infrared phosphor‑converted LEDs are required for wearable biosensing, and their performance hinges on the NIR phosphor. We report a broadband NIR phosphor NaScGe₂O₆:Cr³⁺ that emits 700–1250 nm under 490 nm excitation, powers a 12.07 mW pc‑LED at 350 mA that penetrates human tissue, and shows for the first time 808 nm laser‑excited luminescence.

Abstract

Abstract High‐radiance near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are demanded for wearable biosensing devices and the properties of these pc‐LEDs are highly dependent on the performance of the NIR phosphor. An ultraviolet–visible and NIR‐responded broadband NIR NaScGe 2 O 6 :Cr 3+ phosphor is reported. Under 490 nm excitation, NaScGe 2 O 6 :Cr 3+ shows broad emission band from 700 to 1250 nm, which covers the first and second NIR windows. An NIR pc‐LED with radiant flux of 12.07 mW@350 mA is realized based on NaScGe 2 O 6 :Cr 3+ and 450 nm blue LED chip. The ability of high‐power NIR light of the NIR pc‐LED to penetrate human tissues is observed successfully. Additionally, in NaScGe 2 O 6 :Cr 3+ , the luminescence performance of Cr 3+ under 808 nm laser excitation is achieved for the first time.