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Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+ codoped Ba9Lu2Si6O24 phosphors for NUV-based warm white LED applications

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Abstract

A series of Ce3+–Mn2+ codoped Ba9Lu2Si6O24 (BLS) were synthesized by high-temperature solid-state reactions. The 380–410 nm excitation band of Ce3+ at the Lu sites (Ce(1)) matches well with the emission light of commercial near-ultraviolet (NUV) light-emitting diode (LED) chips. Under the Ce(1) excitation, BLS:Ce3+, Mn2+ exhibited a tunable emission from blue–green to yellow–orange via energy transfers (ETs) from Ce(1) to Mn2+. The ET was demonstrated to be of the resonant type via a dipole–quadrupole mechanism. At room temperature (RT), the optimal internal and external quantum efficiencies (QEs) of BLS:Ce3+, Mn2+ were determined as 79 and 42%. At 150 °C, 85% of the RT QE still can be remained, showing a high thermal stability. A warm white LED (WLED) with a color rendering index of 84 and a correlated color temperature of 3660 K was obtained by combining a 395 nm NUV chip with the phosphor and CaAlSiN3:Eu2+. The efficiency reaches 17 lm W−1 at 20 mA, which is better than the value of most NUV-based WLEDs. These results indicate the promising application of the phosphor as an attractive candidate for WLEDs.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (NSFC11404351, 51672063, 54102317), Project of Science and Technology of Zhejiang Province, China (2016C31110).

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Authors and Affiliations

  1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou, 310018, People’s Republic of China

    Jianxin Zhang & Kaixin Song

  2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People’s Republic of China

    Jianxin Zhang, Yongfu Liu, Haochuan Jiang & Jun Jiang

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  1. Jianxin Zhang
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  2. Yongfu Liu
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Correspondence to Kaixin Song.

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Zhang, J., Liu, Y., Song, K. et al. Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+ codoped Ba9Lu2Si6O24 phosphors for NUV-based warm white LED applications. J Mater Sci: Mater Electron 29, 4547–4556 (2018). https://doi.org/10.1007/s10854-017-8404-2

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