Improved Light Output of AlGaInP-Based Micro-Light Emitting Diode Using Distributed Bragg Reflector (original) (raw)
IEEE Photonics Technology Letters
Abstract
We investigated how the performance and reliability of AlGaInP-based red (620 nm) micro-light-emitting diodes (micro-LEDs) (<inline-formula> <tex-math notation="LaTeX">$25\times 17\,\,\mu \text{m}^{2}$ </tex-math></inline-formula>) were influenced by the use of <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-AlInP ohmic layer and distributed Bragg reflector (DBR). The AlGaAs-based DBR showed reflectivity of 94.9% at 622 nm with a 14 nm-stopband width. The micro-LEDs with <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-GaAs gave slightly lower forward voltages by 0.013 – 0.021 V than those with <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.5</sub>In<sub>0.5</sub>P/<inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.6</sub>Ga<sub>0.4</sub>As and <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.5</sub>In<sub>0.5</sub>P/DBR. However, the micro-LEDs with <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.5</sub>In<sub>0.5</sub>P/<inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.6</sub>Ga<sub>0.4</sub>As and <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.5</sub>In<sub>0.5</sub>P/DBR gave 61% and 125% higher light output power at <inline-formula> <tex-math notation="LaTeX">$20~\mu \text{A}$ </tex-math></inline-formula> compared with that with <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-GaAs. It was shown that after annealing at 120 °C for 2,000 h, the forward voltage and the light output power at 4.7 A/cm<sup>2</sup> of the micro-LEDs with <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-Al<sub>0.5</sub>In<sub>0.5</sub>P/DBR were degraded by 0.09% and 6.33%, respectively, with reference to those before annealing.
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