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- W2094543728 abstract "The contribution of reduction of threading dislocation densities (TDDs) to optical properties is investigated for InGaN/GaN light-emitting diodes (LEDs) grown on sapphire substrate. The external quantum efficiency (EQE) curves depending on the TDDs are discussed both theoretically and experimentally. At the current density of <20 A/cm<sup>2</sup>, the EQE increases with decreasing the edge-type TDD from 5 e8/cm<sup>2</sup> to 2 e8/cm<sup>2</sup>. The current density at the maximum EQE shifts to lower value as the edge-type TDD decreases, whereas the EQE presents no remarkable difference in the highercurrent density range irrespective of the TDD. According to the rate equation (ABC) model, the peak shift reflects the Shockley-Read-Hall non-radiative process (A coefficient). Analysis of the photoluminescence (PL) decay and the dependence of integrated PL intensity on excitation power reveals that the threading dislocations act as non-radiative recombination centers in the multiple quantum well active region. The TDD of <2 e8/cm<sup>2</sup> is required for highly efficient blue LEDs operating at current density of around 15 A/cm<sup>2</sup>, whereas the TDD of <5 e8/cm<sup>2</sup> in required for the LEDs operating at around 50 A/cm<sup>2</sup>." @default.
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- W2094543728 date "2012-02-09" @default.
- W2094543728 modified "2023-09-29" @default.
- W2094543728 title "Effect of dislocation density on efficiency curves in InGaN/GaN multiple quantum well light-emitting diodes" @default.
- W2094543728 doi "https://doi.org/10.1117/12.907679" @default.
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