These phosphors possess high colour purity, excellent thermal stability and high quantum yields. Temperature dependent photoluminescence decay measurements indicated that internal quantum yield decreases much slower than the external one what was related to the decreasing photon escape efficiency from the particle upon increasing the temperature. How to cite this article : Janulevicius, M. Nakamura, S. GaN growth using GaN buffer layer. Bachmann, V. Lim, M. Smet, P. Selecting conversion phosphors for white light-emitting diodes.
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All authors discussed the results and reviewed the manuscript. Correspondence to Arturas Katelnikovas. This work is licensed under a Creative Commons Attribution 4.
Materials Journal of Alloys and Compounds Journal of Luminescence Optical Materials By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate. Article metrics. Advanced search. Skip to main content. You are viewing this page in draft mode. Abstract A good LED phosphor must possess strong enough absorption, high quantum yields, colour purity, and quenching temperatures.
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Introduction Solid state light sources based on the blue emitting InGaN semiconductor chips became a revolution in lighting industry after the discovery of efficient blue emitting diode by S. The QY values were obtained employing the equation 1 14 : where and are integrated emission intensities of the phosphor sample and Teflon, respectively. Figure 1: Rietveld refinement data. Full size image. Figure 2: SEM images.
Figure 3: Reflection spectra and digital photos. Figure 4: Excitation and emission spectra. Figure 6: Photoluminescence decay curves and calculated decay constants.
Figure 7: Temperature dependent photoluminescence decay curves and calculated decay constants. The lines are drawn to guide the eye. Figure 9: Fragments of the CIE colour diagram.
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Figure Emission spectra of LEDs and ceramics. Figure Fragment of the CIE colour diagram. Additional Information How to cite this article : Janulevicius, M. References 1. Article Google Scholar 2. Article Google Scholar 4. Google Scholar 6.