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• W1993202334 abstract "The low-frequency noise sources are investigated in as-prepared and aged GaN light-emitting diodes (LEDs). Accelerated aging is performed by thermal (300h at 240°C) and electrical forward-bias stressing (20 and 50mA for 2500h). At low currents I&lt;IRTS, where IRTS is a critical current, the low-frequency noise is dominated by random telegraph signal (RTS) noise on top of the 1∕f noise. An explanation is given for the giant relative current jumps ΔI∕I≈50% and an expression for IRTS is derived. The RTS noise in our devices is a less-sensitive diagnostic tool for studying the results of accelerated aging. Two components of the 1∕f noise were observed: one is related to the quantum-well junction and the other is due to series resistance noise. The two 1∕f spectra have different current dependences. It was found that the junction 1∕f noise is not significantly affected by aging. However, a strong increase in series resistance noise, by a factor of 60–800 compared to unstressed devices, is observed after strong electrical and thermal aging. This high increase goes hand in hand with a relatively small increase in the value of the series resistance (13%–90%). This makes 1∕f noise a very sensitive reliability indicator for GaN LEDs after accelerated aging. We discuss the physical origin of LED degradation." @default.
• W1993202334 created "2016-06-24" @default.
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• W1993202334 date "2005-06-15" @default.
• W1993202334 modified "2023-09-23" @default.
• W1993202334 title "Low-frequency noise sources in as-prepared and aged GaN-based light-emitting diodes" @default.
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• W1993202334 doi "https://doi.org/10.1063/1.1942628" @default.
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