Improving Color Quality of Nanowire White Light-Emitting Diodes with Mn4+ Doped Fluoride Nanosheets
| Autor: | Barsha Jain, Tung Cao Thanh Pham, Hoang Duy Nguyen, Thi Tuyet Doan, Thi Hong Quan Vu, Ravi Teja Velpula, Hieu Pham Trung Nguyen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Scanning electron microscope Mechanical Engineering Doping Nanowire fluoride nanosheets Phosphor Crystal growth Color temperature III-nitride Article red emission K2TiF6:Mn4+ white light-emitting diodes Control and Systems Engineering Transmission electron microscopy nanowire TJ1-1570 Optoelectronics Mechanical engineering and machinery Electrical and Electronic Engineering business Nanosheet |
| Zdroj: | Micromachines Volume 12 Issue 8 Micromachines, Vol 12, Iss 965, p 965 (2021) |
| ISSN: | 2072-666X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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