Synthesis, luminance and ultraviolet resistance of a copolymer phosphor of Eu-complex and siloxane in near UV-based LED

Synthesis, luminance and ultraviolet resistance of a copolymer phosphor of Eu-complex and... In copolymer phosphors with Eu(III), the majority have difficulty in resisting aging by UV light. In this paper, a novel copolymer phosphor with high thermal resistance and good ultraviolet aging resistance was synthesized by radical polymerization from the Eu-complex and siloxane. Intense red emission peaked at 613 nm, corresponding to the 5D0 → 7F2 transition of Eu(III) ions, was observed under UV excitation. The fluorescence lifetime is calculated as 0.586 ms, with a loss of 0.003 ms after aging for 150 h. The thermal stability shows excellent resistance to high temperature, and the initial decomposition temperature is 153 °C, which meets the requirement of LED operating temperature. The CIE of the LED device is (0.625, 0.308) under excitation at 365 nm. The LED device fabricated with the copolymer and a near-UV LED chip shows bright pure-red emission and good resistance to UV aging. This shows that the copolymer phosphor can be used as an efficient red phosphor in WLEDs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Synthesis, luminance and ultraviolet resistance of a copolymer phosphor of Eu-complex and siloxane in near UV-based LED

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Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-017-2875-x
Publisher site
See Article on Publisher Site

Abstract

In copolymer phosphors with Eu(III), the majority have difficulty in resisting aging by UV light. In this paper, a novel copolymer phosphor with high thermal resistance and good ultraviolet aging resistance was synthesized by radical polymerization from the Eu-complex and siloxane. Intense red emission peaked at 613 nm, corresponding to the 5D0 → 7F2 transition of Eu(III) ions, was observed under UV excitation. The fluorescence lifetime is calculated as 0.586 ms, with a loss of 0.003 ms after aging for 150 h. The thermal stability shows excellent resistance to high temperature, and the initial decomposition temperature is 153 °C, which meets the requirement of LED operating temperature. The CIE of the LED device is (0.625, 0.308) under excitation at 365 nm. The LED device fabricated with the copolymer and a near-UV LED chip shows bright pure-red emission and good resistance to UV aging. This shows that the copolymer phosphor can be used as an efficient red phosphor in WLEDs.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 27, 2017

References

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