Near ultraviolet excited white light emitting diode (WLED) based on the blue LiCaPO 4 :Eu 2+ phosphor
- 能源院－已发表论文 
Abstract(#br)One near ultraviolet (NUV) chip coated with tricolor phosphors to fabricate the white light emitting diode (WLED) has been attractive widely. In this paper, the blue emitting LiCaPO 4 :Eu 2+ , together with the red CaSiAlN 3 : Eu 2+ and the green (Sr, Ba)SiO 4 : Eu 2+ phosphor, is selected as the tricolor components for the NUV excited WLED preparation. The as-prepared WLED exhibits good luminescent performances with the color rendering index (Ra) of 88.6, the correlation color temperature of 3351 K, the lumen efficiency of 77.05 lm/W, and the color coordinates located at (0.4399, 0.4389). It is worth mentioning that the blue-light of the warm WLED succeeds to keep away from the hazard zone centered at 450 nm. Furthermore, a full spectrum warm WLED with the color rendering index (CRI) of 95.8 is fabricated by adding the fourth component as the Sr 5 (PO 4 ) 3 Cl:Eu 2+ phosphor. The prepared full spectrum WLED achieves the performance index of museum lighting.