Photoluminescence and Crystal Structure of Green-Emitting Ca[sub 3]Sc[sub 2]Si[sub 3]O[sub 12]:Ce[sup 3+] Phosphor for White Light Emitting Diodes

Abstract

We have developed a new oxide-based phosphor , which is applicable as a green-emitting color converter for white light emitting diodes (LEDs). This phosphor absorbs blue light around and emits green luminescence, with a peak wavelength around . It is a promising candidate for application in LEDs as quenching of the phosphor at was smaller than that of yellow phosphor. A white LED with high color rendering was fabricated by combining this phosphor with a blue GaN LED and a red phosphor. The luminescence of this phosphor is derived from the 5d-4f transition of the Ce ion and the luminescence decay curve fit a single exponential function. This phosphor has a garnet-type host crystal structure. X-ray absorption fine structure analysis showed that Ce ions replaced the Ca position of the host crystal as .