Abstract
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 LiCaPO4:Eu2+, together with the red CaSiAlN3: Eu2+ and the green (Sr, Ba)SiO4: Eu2+ 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 Sr5(PO4)3Cl:Eu2+ phosphor. The prepared full spectrum WLED achieves the performance index of museum lighting.
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