A novel green‐emitting luminescent materials with broad‐band emission for high‐quality warm white LED indoor lighting
Hang Chen, Yuhua Wang
Abstract
Abstract Following the rapid growth of lighting technology, and in order to satisfy the higher requirement of people for lighting, the high‐quality warm white lighting for indoors has stolen much limelight of researchers. Herein, a novel green phosphor Ce 3+ ‐doped Ca 2 GdHf 2 (AlO 4 ) 3 with garnet structure which can be used for warm white LED was developed by solid‐state method. Under 410 nm light excitation, the phosphor exhibits broad emission spectrum from 450 to 700 nm with FWHM more than 120 nm, and it also owns high internal quantum efficiency of 83.6%. The energy transfer among the activators was identified according to the concentration quenching and decrease of decay time, which belongs to dipole‐dipole interaction. The calculated activation energy is about 0.255 eV, indicating the moderate thermal stability. The fabricated white LED device with low CCT (3807 K) and high CRI ( R a = 89.2) demonstrates its superiority and possibility of practical application in high‐quality warm white LED fields for indoor lighting fields.