Study of the Effect of Injection Currents on White Light Emission of Ce-Doped YAG Phosphor Powder Prepared by Microwave Combustion
| Autor: | Naser M. Ahmed, Khai Shenn Lau, Ahmad Fairuz Omar, Zainuriah Hassan, Husnen R. Abd, Forat H. Alsultany |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Doping Thermal ionization Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences White light Optoelectronics General Materials Science 0210 nano-technology business Microwave |
| Zdroj: | Solid State Phenomena. 301:60-68 |
| ISSN: | 1662-9779 |
| DOI: | 10.4028/www.scientific.net/ssp.301.60 |
| Popis: | The behaviors of yttrium aluminum garnet (YAG) phosphor powder doped by cerium (YAG:Ce3+) was studied. Here, the YAG:Ce3+ nanopowders have been synthesized using microwave combustion (MW) according to the formula, Y(3-0.04) Al5O12: 0.04Ce3+ to produce white light emitting diode (WLEDs) by conversion from blue indium gallium nitride light emitting diode (InGaN LED, 445 nm) chips; the whole process took only 20 min. Pure YAG phase was obtained after annealing at 1050 °C for 5 h with nonaggregated and spherical particles. Thermogravimetry and derivative thermogravimetry (TG/DTG), X-ray powder diffraction (XRPD), transmission electron microscope (TEM), photoluminescence (PL), electroluminescence (EL) emissions and standard CIE 1931 chromaticity diagrams have been used to characterize the samples. The highest WLEDs emission was achieved for the annealed YAG:Ce3+, together with proper color rendering index (CRI), and tunable correlated color temperature (CCT). Finally, we conclude that the decreasing EL intensity at increased injection current is caused by the thermal ionization from the 5d1 level to the conduction band. |
| Databáze: | OpenAIRE |
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