Influence of electron irradiation on the electroluminescence spectra of white InGaN light emitting diodes
We analyze the influence of electron irradiation on the electroluminescence spectra of white light emitting diodes (LEDs) based on indium gallium nitride. Three different irradiation fluences, 9.90×1015 , 1.32×1016 and 1.98×1016 cm-2 , are studied. For all 27 samples of LEDs of the commercially...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Institute of Physical Optics
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/66909/ http://irep.iium.edu.my/66909/ http://irep.iium.edu.my/66909/ http://irep.iium.edu.my/66909/1/66909_Influence%20of%20electron%20irradiation%20on%20the%20electroluminescence%20_article.pdf http://irep.iium.edu.my/66909/2/66909_Influence%20of%20electron%20irradiation%20on%20the%20electroluminescence%20_scopus.pdf http://irep.iium.edu.my/66909/13/66909_Influence%20of%20electron%20irradiation_wos.pdf |
| Summary: | We analyze the influence of electron irradiation on the electroluminescence
spectra of white light emitting diodes (LEDs) based on indium gallium
nitride. Three different irradiation fluences, 9.90×1015
, 1.32×1016 and 1.98×1016 cm-2
,
are studied. For all 27 samples of LEDs of the commercially available models
VAOL-5GWY4, VAOL-10GWY4 and OVL-3321, we observe a significant
decrease in the emission light intensity after the irradiation. Degradation of the
overall light intensity is believed to be due to irradiation-induced defects which act
as nonradiative recombination centres. We also study the emission intensities and
the central wavelengths of the LED samples subjected to electron irradiation under
conditions of different injection currents. After irradiation with the fluence
1.98×1016 cm-2
, the blue peak located at 453 nm experiences severe degradation, so
that only the yellow luminescence at 590 nm remains. This yellow band is related to
radiative transitions from donor bands to the levels associated with gallium
vacancies |
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