Mn4+-activated oxyfluoride K3TaOF6 red phosphor with intense zero phonon line for warm white light-emitting diodes
| Autor: | Jiao Wu, Zhiyuan Liu, Qingguang Zeng, Kang Zhang, Bo Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Analytical chemistry Thermal ionization Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Thermoluminescence Spectral line 0104 chemical sciences Ion Crystal 0210 nano-technology Absorption (electromagnetic radiation) Luminous efficacy |
| Zdroj: | RSC Advances. 11:26120-26126 |
| ISSN: | 2046-2069 |
| Popis: | The intense zero phonon line (ZPL) of the Mn4+:2E→4A2 transition can further promote the color rendering and luminous efficiency for high-quality white-emitting diodes (w-LEDs). In this article, a Mn4+-activated K3TaOF6 oxyfluoride red phosphor was synthesized via a facile two-step method. Its phase and morphology were characterized by X-ray diffraction, SEM and TEM. The as-prepared K3TaOF6:Mn4+ exhibits an intense absorption of blue light and a strong emission band peaking at 628 nm with a color purity as high as 96.4%. Attributed to the distorted octahedral coordination environment of Mn4+ ions, an intense ZPL emission was detected at 620 nm. By theoretical calculation, Mn4+ ions in the K3TaOF6 host experience a strong crystal field. In addition, the temperature-dependent PL and thermoluminescence (TL) spectra suggest that thermal ionization dominates the thermal quenching phenomenon in this phosphor. |
| Databáze: | OpenAIRE |
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