Voltage-controlled variable light emissions from GaN codoped with Eu, Er, and Tm

Abstract

In this letter, a model to calculate the emission intensities of different rare-earth (RE) dopants in GaN is proposed based on the quantum collision theory and Judd-Ofelt approximation. The possible white light emission from Eu-, Er-, and Tm-codoped GaN is predicted according to the Commission International de I’Eclairage chromaticity diagram. Variable-wavelength emissions can be realized by adjusting the relative concentrations of different RE dopants in GaN and the bias voltage of the applied electric field. The availability of voltage-controlled light emissions and white light emission of the RE-doped GaN electroluminescent devices may have great potential for application in displays.