Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5312
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Funding
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Special Project of National Major Scientific Equipment Development of China [2012YQ120060]
- 973 program of MOST [2014CB845605]
- NSFC [11004191, U1305244, 21325104]
- Key Project of Science and Technology Foundation of Fujian Province [2011HZ0001-2, 2013I0009]
- Fujian Provincial Natural Science Foundation for Young Scientists [2014J05070]
- Ministry of Science and Technology of Taiwan [MOST 101-2113-M-002-014-MY3]
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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 K2TiF6, K2SiF6, NaGdF4 and NaYF4. Particularly we achieve a photoluminescence quantum yield as high as 98% for K2TiF6: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 K2TiF6: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.
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