Cerium Compounds in LEDs Technology

Abstract

This chapter explores the application and benefits of cerium compounds in LEDs, delving into their impact on photoluminescence, electroluminescence, quantum efficiency, and color quality. Cerium compounds (CeO2) play a crucial role in enhancing the efficiency of LEDs. Phosphors are substances that absorb photons and emit light of different wavelengths. By introducing cerium compounds as phosphors in LEDs, the conversion of blue light to other colors becomes more efficient, resulting in improved luminous efficacy. In this chapter, the study on YAG:Ce phosphor material shows that vacuum annealing tends to suppress Ce3+ oxidation more than air annealing, leading to a considerable 20% increase in photoluminescence emission intensity. The optimized YAG:Ce nanoparticles were used to create a white light emitting diode (WLED) that produced cool-white light with a maximum radiation luminous efficacy of 285 lm/W and a comparable color rendering index of 83. Furthermore, Na2MgSiO4:Ce3+:Li+ phosphor study displays tunable emission color characteristics when the content of Ce3+ is increased or Li+ is added as a charge compensator. The utilization of cerium compounds (CeO2) has demonstrated significant efficiency and color quality improvements on YAG:Ce and Na2MgSiO4:Ce3+:Li+ phosphor components.