Optical and Color Properties of Green and Red Phosphor Mixtures Doped into Hybrid Sol-gel Matrix to Generate White Light

摘要

Eu(tta)_3phen and Tb(4DBBA)_3TPPO were synthesized as red and green phosphor for generating white light under the excitation of UV LED. The phosphor materials were doped into hybrid sol-gel (VTES:TEOS) matrix with different ratio of 1:8, 1:16, 1:25, 1:30, 1:40 and 1:50. The samples were fabricated as thick films by drop-casting and heat treated at 60°C overnight. Photoluminescence spectra were measured using spectrafluorometer system. Measurement of color properties such as color rendering index (CRI), color temperature and Commission Internationale de L'Eclairge coordinates were recorded by exciting the samples using a 380 nm UV LED and focused the generated light into an integrating sphere. Based on the results, the mix ratio of 1:40 produce the nearest coordinate within the white color region with correlated color temperature around 3700 K to 4200 K.