Fabrication and Illuminance Properties of Phosphor-conversion Green Light-emitting Diode with a Luminous Efficacy over 100 lm/W

Abstract

We have developed phosphor-conversion green light-emitting diode (LED) based on a combination of near-ultraviolet (n-UV) LED and the green phosphor material of SrBaEuSiO, which can provide a luminous efficacy over 110 lm/W at a wavelength of about 530 nm. The present green LED structure is expected to cover the longer wavelengths beside 520 nm that are impossible to generate by semiconductor LEDs with high luminous efficacy. By improving the external quantum efficiency of n-UV LED chips and the extraction efficacy in the phosphor, it is theoretically anticipated that the luminous efficacy can be increased to be about 210 lm/W.