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Color-Tunable Al6Si2O13:Eu2+,Mn2+ Phosphor with High Color Rendering Index Based on Energy Transfer for Warm White LED

Abstract

It is very necessary to develop the LED with high color-index for many special applications. In this paper, a novel single-phase warm-white-emitting 3/2-mullite (Al6Si2O13):Eu2+,Mn2+ phosphors were prepared via high-temperature solid-state reaction. The emission hue can be precisely controlled from (0.2496, 0.3032) to (0.4001, 0.3031) by altering Eu2+/Mn2+ ratio via energy transfer, in which warm-white emission with CIE coordinate of (0.3440, 0.3302) is achieved by using UV-excited Al6Si2O13:2.0%Eu2+,0.6%Mn2+ phosphor. The energy transfer between Eu2+ and Mn2+ in Al6Si2O13 host is demonstrated to be nonradiative dipole-dipole interaction. A warm-white LED device composing of Al6Si2O13:2.0%Eu2+,0.6%Mn2+ phosphor and NUV (365 nm) chip operated at 120 mA current, has white-light emission with correlated color-temperature of 5656 K and color coordinates of (0.3289, 0.3413). Moreover, it should be noted the color rendering indices of Ra and R9 can reach 92.4 and 97.0, respectively. Our proposed Al6Si2O13:2.0%Eu2+,0.6%Mn2+ phosphor with high color rendering index has good application prospects.

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Publication details

The article was received on 27 Jun 2018, accepted on 04 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ03184C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Color-Tunable Al6Si2O13:Eu2+,Mn2+ Phosphor with High Color Rendering Index Based on Energy Transfer for Warm White LED

    B. Yan, G. Wang, L. Liu, X. Wang, Y. Chen and J. Han, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03184C

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