Journal
MICROMACHINES
Volume 12, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/mi12080965
Keywords
fluoride nanosheets; red emission K2TiF6:Mn4+; III-nitride; nanowire; white light-emitting diodes
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Funding
- Ho Chi Minh City Department of Science and Technology (HCMC DOST) [113/2019/HD-QPTKHCN]
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The study on a two-dimensional nanostructured fluoride red-emitting phosphor shows its high quantum yield, excellent red emission properties, and thermal stability, with high color rendering index and correlated color temperature when integrated into nanowire WLEDs.
A two-dimensional nanostructured fluoride red-emitting phosphor with an excellent quantum yield of similar to 91% is studied for cost-effective and high-color quality nanowire white light-emitting diodes (WLEDs). K2TiF6:Mn4+ phosphors are synthesized via an emulsification method using surfactants as sodium dodecyl sulphonate and oleic acid. The K2TiF6:Mn4+ phosphors in ultra-thin and nanosheet crystals are observed via scanning electron microscopy and high-resolution transmission electron microscopy. The surfactants are found to play a key role in inhibition of KTFM crystal growth process and stabilization of Mn4+ ions doping into the K2TiF6 host. The prepared phosphors exhibited intensive red emission at approximately 632 nm and excellent thermal stability in the range of 300-500 K upon 460 nm light excitation. Moreover, the K2TiF6:Mn4+ nanosheets were integrated on InGaN/AlGaN nanowire WLEDs for color quality study. The results show that the nanowire WLEDs with red-emitting phosphor exhibit unprecedentedly high color rendering index similar to 96.4, and correlated color temperature similar to 4450 K.
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