Lanthanide based phosphor materials for white LEDs

Abstract

Semiconductor based white light-emitting diodes (WLEDs) are considered as a new class of lighting sources due to their excellent properties over the incandescent lightings. Currently the major challenges in WLEDs research are to achieve high luminous efficacy, high chromatic stability, brilliant color-rending properties, and price cheapness against fluorescent lamps, which rely critically on the phosphor properties. In recent years, several efforts have been made to develop single-phase white-light-emitting phosphors for near-ultraviolet or ultraviolet excitation to solve the above challenges with certain achievements. There are several methods are available to achieve the same, however here efforts have been made to understand the white light emission in a single-phase host by doping a single rare earth ion (Eu3+ or Eu2+) into appropriate single-phase host.