Efficient Blue-emitting Phosphor SrLu₂O₄:Ce³⁺ with High Thermal Stability for Near Ultraviolet (~400 nm) LED-Chip based White LEDs.

ABSTRACT: Blue-emitting phosphors for near ultraviolet (NUV) based tri-color RGB phosphor blend converted white light emitting diodes (LEDs) have been extensively investigated in the past few years. LED chip peaked near 400 nm is the most efficient among the NUV chips currently. However, most of blue phosphors show inefficient excitation around 400 nm. Herein, a novel blue phosphor SrLu₂O₄:Ce³⁺ matching well with near 400 nm chip and showing high thermal stability has been developed. The photoluminescence spectrum presents a broad emission band peaking at 460 nm with a bandwidth of nearly 90 nm. By optimizing the Ce³⁺ concentration, an internal quantum efficiency (IQE) as high as 76% was achieved. Furthermore, 86% of the room-temperature emission intensity

SUBMITTER: Zhang S 

PROVIDER: S-EPMC6041296 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature