A high-performance non-rare-earth deep-red-emitting Ca14-xSrxZn6Al10O35:Mn4+ phosphor for high-power plant growth LEDs

Abstract

Red or deep-red-emitting wavelength-conversion materials with high efficiency are highly essential for the applications of high-power plant growth LEDs. Herein, a series of deep-red-emitting Ca14-xSrxZn6Al10O35:Mn4+ phosphors (x = 0–2.4) showing high quantum efficiency (the IQE and EQE values up to 83% and 53%, respectively), low thermal quenching effect (∼98% at 150 °C relative to that at room temperature) are successfully synthesized. The X-ray diffraction, scanning electron microscopy, photoluminescence spectra, diffuse reflectance spectra, luminescence decay curves, and temperature-dependent emission spectra are systematically investigated. Furthermore, a plant growth LED lamp is fabricated by using the synthesized Ca14-xSrxZn6Al10O35:Mn4+ phosphors. Considering their excellent wavelength-conversion properties, the non-rare-earth-containing compositions, as well as mild synthesis processes, the Ca14-xSrxZn6Al10O35:Mn4+ phosphors have great potentials in the applications of high-power plant growth LEDs.