Issue 103, 2015

Fabrication and application of non-rare earth red phosphors for warm white-light-emitting diodes

Abstract

In this work, a facile and efficient method for the preparation of K2XF6:Mn4+ (X = Si, Ti and Ge) red phosphors is reported. They were synthesized by adding KF to precipitate a warm mixed solution with XO2, KMnO4 and HF as raw materials. After the doping of Mn4+, although the obtained products exhibit irregular micro-sized particulate morphologies, they present the same single phases as their matrices and no impurities can be found. The optical properties of the fluoride complexes were investigated using photo-luminescence spectroscopy, diffuse reflectance spectroscopy, and luminescence decay curves. The complexes presented bright red emission under blue light illumination, and warm white-light-emitting diodes with low correlated color temperature, high color rendering index and high luminous efficiency, with values of 3156 K, 84.9 and 138.4 lm W−1, respectively, were achieved by coating a mixture of the red phosphor with commercial Y3Al5O12:Ce3+ on blue-GaN chips.

Graphical abstract: Fabrication and application of non-rare earth red phosphors for warm white-light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
02 Sep 2015
Accepted
25 Sep 2015
First published
25 Sep 2015

RSC Adv., 2015,5, 84821-84826

Author version available

Fabrication and application of non-rare earth red phosphors for warm white-light-emitting diodes

Q. Zhou, Y. Zhou, Z. Wang, Y. Liu, G. Chen, J. Peng, J. Yan and M. Wu, RSC Adv., 2015, 5, 84821 DOI: 10.1039/C5RA17846K

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