UV‐Excited Gd1–xEuxAl₃(BO₃)₄ Red Phosphors for White Lighting Emission Diodes and Plant Growth Light‐Emitting Diodes

A series of Gd 1– x Eu x Al 3 (BO 3 ) 4 red light‐emitting phosphors, where 0 ≤ x ≤ 15.0%, are prepared by high‐temperature solid‐phase method and characterized through X‐ray diffraction, Fourier‐transform infrared spectroscopy, scanning electron microscopy, photoluminescence emission and excitation, luminescence decay, and thermoluminescence studies. Under 274 and 396 nm UV excitations, intense red luminescence is observed through 5 D 0 → 7 F 0,1,2,3,4 transitions. Based on concentration‐dependent luminescence spectra, the Eu 3+ concentration is optimized to be 12.0% for efficient red luminescence. The Commission International de I’Eclairage coordinates and hence the color purity and correlated color temperature values are obtained from the emission spectra. The thermal stability is examined using the temperature‐dependent luminescence study. The high amount of color purity and thermal stability of Eu 0.12 Gd 0.88 Al 3 (BO 3 ) 4 phosphor shows its suitability as the best replacement for red component in phosphor‐converted white light‐emitting diodes (LEDs) as well as indoor plant growth LEDs.