Penetrating Biological Tissue Using Light-Emitting Diodes with a Highly Efficient Near-Infrared ScBO3:Cr3+ Phosphor
Journal
Chemistry of Materials
Journal Volume
32
Journal Issue
5
Pages
2166-2171
Date Issued
2020
Author(s)
Mu-Huai Fang et al.
Abstract
Recently, infrared (IR) light-emitting diodes (LEDs) have attracted considerable interest in the research field worldwide. IR phosphors, the basic materials utilized in LEDs, have become a research hotspot as well. Here, we introduce the high-quantum-efficiency IR ScBO3:Cr3+ phosphor, which provides a spectral range of emission from 700 to 1000 nm with a peak maximum at 800 nm. Electron paramagnetic resonance spectroscopy, with high element selectivity, was used to elucidate the unusual small peak in the photoluminescence spectrum. Phonon structure and electron-lattice interaction were well observed and discussed via temperature-dependent measurements. Moreover, the high quantum efficiency of 72.8% was achieved. To evaluate their potential practical application, phosphor-converted LED packages were designed, which revealed high stability and high output power of 39.11 mW. Furthermore, the fabricated IR LED demonstrated a remarkable ability to penetrate biological tissues. This study provides insights into the luminescent properties and the practical applications of IR LEDs. Copyright ? 2020 American Chemical Society.
Subjects
Efficiency; Electron spin resonance spectroscopy; Infrared devices; Light emission; Light emitting diodes; Paramagnetic resonance; Phonons; Phosphors; Photoluminescence spectroscopy; Tissue; Electron paramagnetic resonance spectroscopy; Electron-lattice interactions; High quantum efficiency; Infrared light emitting diodes; Luminescent property; Phosphor-converted leds; Photoluminescence spectrum; Temperature-dependent measurements; Quantum efficiency
SDGs
Type
journal article