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9 March 2022 Dual-functional colloidal quantum dot light-emitting diodes as a device platform for realizing solution-processable laser diodes
Jeongkyun Roh, Young-Shin Park, Jaehoon Lim, Victor Klimov
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Proceedings Volume PC12024, Advances in Display Technologies XII; PC1202403 (2022) https://doi.org/10.1117/12.2609661
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
The realization of solution-processable laser diodes will open new opportunities in a range of photonic and optoelectronic applications. Colloidal quantum dots (QDs) have gained considerable attention for attaining this goal because of excellent optical properties such as readily tunable emission wavelengths and a near-unity photoluminescence quantum yield. However, demonstration of electrically pumped lasers using colloidal QDs has not been achieved mainly due to their fast nonradiative Auger recombination that plagues generation of optical gain. Important milestones toward QD laser diodes have been achieved as a result of great progress in suppressing Auger recombination; achievement of low lasing threshold under optical excitation and population inversion and optical gain with electrical injection. These achievements guide us to the next step, which is the incorporation of an optical cavity into the LED structure. Here, we demonstrate a dual functional QD-LED with an integrated optical cavity as a promising device platform for realizing solution-processable laser diodes. These devices work well as both LEDs and optically pumped lasers as a result of careful optimization of refractive-index profile across the device. The remaining challenges to realize QD laser diodes will be also discussed.
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Jeongkyun Roh, Young-Shin Park, Jaehoon Lim, and Victor Klimov "Dual-functional colloidal quantum dot light-emitting diodes as a device platform for realizing solution-processable laser diodes", Proc. SPIE PC12024, Advances in Display Technologies XII, PC1202403 (9 March 2022); https://doi.org/10.1117/12.2609661
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KEYWORDS
Semiconductor lasers
Light emitting diodes
Quantum dots
Laser optics
Luminescence
Optical properties
Optical pumping
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