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HomeMaterials Science ForumMaterials Science Forum Vol. 848A Promising Energy-Saving and...

A Promising Energy-Saving and Environmental-Friendly Lighting Device: High CRI White LED with Phosphor Materials

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Abstract:

Two kinds of commercial LED phosphors (green phosphor LuAG:Ce³⁺ and red phosphor CaAlSiN₃:Eu²⁺) with polymethyl methacrylate (PMMA) powders were mixed to prepare film phosphors with tunable emission peak in photoluminescence spectrum by flat vulcanizing machine under the temperature of 170 ^oC and pressure of 2 MPa. The physical phase, surface morphology, transmittance, luminescence spectra of samples were characterized by means of X-ray diffraction (XRD), Environmental scanning electron microscopy (ESEM), Ultraviolet-Visible (UV-Vis) spectrophotometry and Fluorescence spectrometer. The results show that the film phosphors phase was consistent with raw phosphors, phosphor particles were uniformly distributed, and fluorescence spectra with different proportions of phosphors in different position can be adjusted. Tested by HSP 3000 spectrum analyzer, the white LEDs fabricated by blue chip and composite film phosphor containing 5 wt% green phosphor and 1.5 wt.% red phosphor, which refers to the remote excitation technique, possessed color coordinate of (0.3715, 0.3280) and color rendering index (CRI) of 87 when it was driven at power of 36 V/140 mA, reaching the international advanced level.

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Periodical:

Materials Science Forum (Volume 848)

Pages:

446-453

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.848.446

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Online since:

March 2016

Authors:

Sheng Liu, Bei Ying Zhou, Shi Jia Gu, Lian Jun Wang*, Wan Jiang, Wei Luo

Keywords:

CRI, Film Phosphors, LED, Phosphor, Polymethyl Methacrylate

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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