Self-Activated Green-Yellow Emitting Gd2CaZnO5 Phosphor for Efficient Ultra-Violet Light-Emitting Diodes
| Autor: | Shailesh Narain Sharma, Swati Bishnoi, Vishnu V. Jaiswal, Savvi Mishra, G. Swati, Naina Lohia, D. Haranath, Manoj Mohapatra |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Photoluminescence business.industry Biomedical Engineering Bioengineering Phosphor 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention law Excited state Optoelectronics General Materials Science Orthorhombic crystal system 0210 nano-technology Luminescence business Excitation Light-emitting diode Diode |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 20:3754-3761 |
| ISSN: | 1533-4880 |
| DOI: | 10.1166/jnn.2020.17499 |
| Popis: | A new self-activated green-yellow emitting Gd2CaZnO5 (GCZO) phosphor was synthesized using solid-state reaction method at high-temperature. XRD analysis confirmed the orthorhombic structure of the sample with the Pbnm space group. SEM micrographs reveal the irregular morphology with micron sized particles. Detailed photoluminescence (PL) analysis revealed that the excitation of the phosphor lies in the UV range (˜377 nm) with the related broad green-yellow emission centered at 530 nm. The broad band emission ranging from ˜450 nm to 650 nm can be attributed to the surface defects and oxygen vacancies. The calculated luminescence decay lifetime for the optimized phosphor was found to be 2.925 μs. Furthermore, the color-coordinate (x, y) were calculated and found to be (0.44, 0.45), which lies in the green-yellow (˜540 nm) region of the electromagnetic spectrum. The values of color coordinates and Color correlated temperature of 3289 K support the synthesized phosphor for the emission of warm white-light. These results perfectly established the suitability of this green-yellow emitting GCZO phosphor for Ultra-Violet Light-Emitting Diodes (LEDs) excited white-LED applications. |
| Databáze: | OpenAIRE |
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