Dependence of CCT and CRI on the variable excitation wavelength and on the weight ratio of the phosphor in polydimethylsiloxane

Abstract

This paper examines how the variable excitation wavelength affects CCT (correlated colour temperature) and CRI (colour rendering index) of the light generated by the luminescent layer. Two types of samples with a defined layer thickness and with a defined weight ratio of the YAG:Ce (cerium-doped yttrium aluminium) phosphor in PDMS (polydimethylsiloxane) were used. The measurements were performed in the wavelength range from 440 nm to 470 nm. The measurement results indicate that by using a suitable excitation wavelength and a suitable phosphor weight ratio in a luminescent layer of a defined thickness, the CCT and CRI parameters can be optimized.