Study Of The Effect Of Injection Currents On White Light Emission Of Ce-Doped Yag Phosphor Powder Prepared By Microwave Combustion

Abd, Husnen R. and Hassan, Z. and Ahmed, Naser M. (2019) Study Of The Effect Of Injection Currents On White Light Emission Of Ce-Doped Yag Phosphor Powder Prepared By Microwave Combustion. In: International Conference On Semiconductor Materials Technology.

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Abstract

Cerium doped yttrium aluminum garnet (YAG:Ce+3) nanopowders have been synthesized using microwave combustion (MW) according to the formula, Y(3- 0.04)Al5O12: 0.04Ce+3 to produce white light emitting diode (WLED) 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 at sintering temperature of 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), electroluminescence (EL) emissions and standard CIE 1931 chromaticity diagrams have been used to characterize the samples. The highest WLED emission was achieved for the annealed YAG:Ce, 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.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QC Physics > QC1-999 Physics
Divisions: Institut Penyelidikan dan Teknologi Nano Optoelektronik (Institute of Nano Optoelectronics Research and Technology (INOR)) > Conference or Workshop Item
Depositing User: Mr Aizat Asmawi Abdul Rahim
Date Deposited: 14 Apr 2021 00:37
Last Modified: 14 Apr 2021 00:37
URI: http://eprints.usm.my/id/eprint/48879

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