A novel Cr3+-doped Lu2CaMg2Si3O12 garnet phosphor with broadband emission for near-infrared applications. Issue 24 (27th May 2021)

• Record Type: Journal Article
• Authors: Nie, Wendong; Yao, Liqin; Chen, Guang; Wu, ShiHao; Liao, Zhijian; Han, Lei; Ye, Xinyu
• Is Part Of: Dalton transactions. Volume 50:Issue 24(2021)
• Page Start: 8446
• Page End: 8456
• Publication Date: 2021-05-27
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt01195b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : (a) Luminescence spectra of the NIR pc-LED at different drive currents. (b) NIR output power and photoelectric efficiency at different drive currents. Abstract : Near-infrared (NIR) phosphor-converted light emitting diode (pc-LED) light sources have broad application prospects in environmental science, biomedical and plant growth fields. However, NIR phosphors still suffer from narrowband emission and low thermal stability. Here, we prepared a novel Lu2 CaMg2− x Si3 O12 : x Cr 3+ (LCMS: x Cr 3+, x = 0.005–0.06) phosphor with broadband emission by a high-temperature solid state reaction. Under excitation at 450 nm, the emission spectrum of the LCMS:0.05Cr 3+ phosphor shows a broadband emission in the range of 650–1000 nm with a large full width at half maximum (FWHM) of 125 nm and an R-line emission of 692 nm. In addition, the LCMS:0.05Cr 3+ phosphor has good thermal stability and can maintain 70% emission intensity at 150 °C relative to that at room temperature. The LCMS:0.05Cr 3+ phosphor exhibits a high internal quantum efficiency (IQE) of ∼76%. Using this phosphor, a NIR pc-LED with photoelectric efficiencies of 14.8% at 100 mA and 6.0% at 320 mA and NIR output powers of 59.5 mW at 100 mA and 181.0 mW at 320 mA was obtained. The broadband LCMS:0.05Cr 3+ phosphor with a NIR emission peaked at 750 nm can serve as a light source for plant cultivation and has superior application prospects in the agriculture field.