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- Title
Improving Color Quality of Nanowire White Light-Emitting Diodes with Mn 4+ Doped Fluoride Nanosheets.
- Authors
Vu, Thi Hong Quan; Doan, Thi Tuyet; Jain, Barsha; Velpula, Ravi Teja; Pham, Tung Cao Thanh; Nguyen, Hieu Pham Trung; Nguyen, Hoang-Duy
- Abstract
A two-dimensional nanostructured fluoride red-emitting phosphor with an excellent quantum yield of ~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 ~96.4, and correlated color temperature ~4450 K.
- Subjects
NANOSTRUCTURED materials; LIGHT emitting diodes; PHOSPHORS; SCANNING transmission electron microscopy; NANOWIRES; TRANSMISSION electron microscopy; OLEIC acid
- Publication
Micromachines, 2021, Vol 12, Issue 8, p965
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi12080965