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Current crowding effect on light extraction efficiency of thin-film LEDs
M.V. Bogdanov, K.A. Bulashevich, O.V. Khokhlev, I.Yu. Evstratov, M.S. Ramm, S.Yu. Karpov
phys. stat. solidi (c) 7, No 7-8, 2124–2126 (2010) / DOI 10.1002/pssc.200983415 (28) |
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| Using coupled 3D modelling of electrical, thermal, and optical processes, we consider operation of a blue
LED with advanced thin-film flip-chip design. Significant effect of current crowing on light extraction
from the LED die is predicted theoretically. As a result, the light extraction efficiency is found to decrease
remarkably with the operation current. The nature of the effect is identified, and some ways for improvement
of the high-current extraction efficiency are suggested and examined by simulations. |
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