Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Haomiao Zhu, Chun Che Lin, Wenqin Luo, Situan Shu, Zhuguang Liu, Yongsheng Liu, Jintao Kong, En Ma, Yongge Cao, Ru Shi Liu, Xueyuan Chen

Research output: Contribution to journalArticle

656 Citations (Scopus)

Abstract

Mn4+-activated fluoride compounds, as an alternative to commercial (oxy)nitride phosphors, are emerging as a new class of non-rare-earth red phosphors for high-efficacy warm white LEDs. Currently, it remains a challenge to synthesize these phosphors with high photoluminescence quantum yields through a convenient chemical route. Herein we propose a general but convenient strategy based on efficient cation exchange reaction, which had been originally regarded only effective in synthesizing nano-sized materials before, for the synthesis of Mn4+-activated fluoride microcrystals such as K2 TiF6, K2 SiF6, NaGdF4 and NaYF4. Particularly we achieve a photoluminescence quantum yield as high as 98% for K2 TiF6:Mn4+. By employing it as red phosphor, we fabricate a high-performance white LED with low correlated colour temperature (3,556 K), high-colour-rendering index (R a=81) and luminous efficacy of 116 lm w-1. These findings show great promise of K2 TiF6:Mn4+ as a commercial red phosphor in warm white LEDs, and open up new avenues for the exploration of novel non-rare-earth red emitting phosphors.

Original languageEnglish
Article number4312
JournalNature Communications
Volume5
DOIs
Publication statusPublished - Jul 8 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Zhu, H., Lin, C. C., Luo, W., Shu, S., Liu, Z., Liu, Y., Kong, J., Ma, E., Cao, Y., Liu, R. S., & Chen, X. (2014). Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes. Nature Communications, 5, [4312]. https://doi.org/10.1038/ncomms5312