Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000406
Keywords
InGaN quantum dots; micro‐ LEDs; morphology; photoluminescence; visible‐ light communication
Categories
Funding
- National Key Research and Development Program [2016YFB0401803]
- S&T Challenging Project [2016003]
- National Natural Science Foundation of China [61974080, 61822404, 61904093]
- China Postdoctoral Science Foundation [2018M640129, 2019T120090]
- Beijing National Research Center for Information Science and Technology [BNR2019ZS01005, BNR2019RC01006]
- Tsinghua University Initiative Scientific Research Program [20193080004]
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In this study, InGaN quantum dots were proposed as the active region of micro-LEDs to address efficiency and bandwidth limitations. The results showed that utilizing InGaN QDs can provide a solution for higher efficiency and wider bandwidth micro-LEDs in display and VLC applications.
Micro-LEDs are regarded as ideal light sources for next-generation display and high-speed visible-light communication (VLC). However, the conventional micro-LEDs based on InGaN quantum well (QW) active region suffer from a low efficiency under small injection (below 1 A cm(-2)) due to the size-dependent effect and a limited 3 dB bandwidth (hundreds of MHz) due to quantum-confined Stark effect. Here, InGaN quantum dots (QDs) are proposed as the active region of micro-LEDs to address these challenges for their strong localization and low-strain features. Green InGaN QDs are self-assembled under Stranski-Krastanov (SK) and Volmer-Weber (VW) modes by using metal organic vapor phase epitaxy. The SK QDs can shift the peak efficiency of a micro-LED to an extremely low current density of 0.5 A cm(-2) (almost two orders of magnitude lower compared to QW ones) with an external quantum efficiency of 18.2% (nearly two times higher than present green micro-LEDs). Besides, green micro-LEDs based on VW QDs reach a 3 dB bandwidth of 1.3 GHz. These results indicate that InGaN QDs can provide an ultimate solution to micro-LEDs for display and VLC applications, especially since they are fully compatible with current light-emitting diode (LED) industrial technology.
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