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A new cationic iridium(III) complex applied as the luminescence conversion material in InGaN-based light-emitting diodes

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Abstract

A new cationic iridium(III) complex [(ppy)2Ir(L)]PF6 (ppy = 2-phenylpyridine, L = 1,1′-diethyl-1H,1′H-2,2′-bibenzo[d]imidazole) was synthesized and characterized by ultraviolet–visible absorption spectra, thermogravimetry and photoluminescence. The mixtures of the iridium(III) complex powder blended in epoxy resin at the concentration of 6.0, 8.0 and 10.0 wt % were applied as the luminescence conversion material in light-emitting diodes (LEDs) in incorporation with 395 nm-emitting InGaN chips. The emission of the InGaN chip was completely absorbed by the iridium(III) complex and only greenish yellow light of the iridium(III) complex was emitted from the LEDs with CIE color coordinates around (0.45, 0.53). At 20 mA forward current, the LEDs exhibited the maximum power efficiency of 13.1 lm W−1 at an optimal blending concentration of 8.0 wt %.

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Acknowledgments

This work was supported by National Nature Science Foundation of China (No. 21262046 and 21261027), and Key Scientific Research Fund of Yunnan Province Education Department (No. 2011Z003).

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Authors and Affiliations

  1. Engineering Laboratory of Polylactic Acid-Based Functional Materials of Yunnan, Key Laboratory of Comprehensive Utilization of Mineral Resources in Ethnic Districts, School of Chemistry and Biotechnology, Yunnan Minzu University, Kunming, 650500, China

    Huaijun Tang, Guoyun Meng, Zeyu Chen, Yong Liu, Liying Wei & Zhengliang Wang

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  1. Huaijun Tang
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  2. Guoyun Meng
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  3. Zeyu Chen
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  4. Yong Liu
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Correspondence to Huaijun Tang or Zhengliang Wang.

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Tang, H., Meng, G., Chen, Z. et al. A new cationic iridium(III) complex applied as the luminescence conversion material in InGaN-based light-emitting diodes. J Mater Sci: Mater Electron 26, 2824–2829 (2015). https://doi.org/10.1007/s10854-015-2764-2

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  • DOI: https://doi.org/10.1007/s10854-015-2764-2

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