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Fig. 5. Simulated IQE as a function of the injection current for the three samples.

IQE. C>A 30%. A>B 17%. Fig. 5. Simulated IQE as a function of the injection current for the three samples. Conclusion. The experimental results indicate that the adoption of step-graded AlGaN EBLs has little influence on the electrical properties of the fabricated LEDs.

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Fig. 5. Simulated IQE as a function of the injection current for the three samples.

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  1. IQE C>A 30% A>B 17% Fig. 5. Simulated IQE as a function of the injection current for the three samples. 9

  2. Conclusion The experimental results indicate that the adoption of step-graded AlGaN EBLs has little influence on the electrical properties of the fabricated LEDs. And experiments show that the IEBL gives rise to inferior optical performance, compared to the DEBL and original EBL. Simulation results, the DEBL can improve performance is attributed to enhanced hole injection without losing the capability of electron confinement. 10

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