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13 March 2024 Recent advances in red, blue, and green ultra high-power LEDs for étendue-limited applications
Benjamin Schulz, Lorenzo Zini, Clemens Vierheilig
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Proceedings Volume 12906, Light-Emitting Devices, Materials, and Applications XXVIII; 129060I (2024) https://doi.org/10.1117/12.3003740
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
In this paper, we report the latest advances in light-emitting diodes (LEDs) of the three primary colors red, blue, and green optimized for ultra high-power operation to achieve highest luminance and radiance values. These kinds of LEDs are mainly used in étendue-limited applications, particularly projectors. For the three colors different material systems are used: AlInGaP for red and InGaN for blue and green, while green uses a blue chip combined with a green ceramic converter. The chip designs and epitaxies have been modified compared to lower power versions to withstand high current densities up 6.6 A/mm² for blue, up to 4.5 A/mm² for red. The LED chips have been optimized at this operating point. The latest improvements show an increase of 8% in luminance for red, 17% for green, and 15% in radiance for blue compared to the previous generation. The LEDs using the latest improvement measures are setting the benchmark for ultra high-power LED technology.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Benjamin Schulz, Lorenzo Zini, and Clemens Vierheilig "Recent advances in red, blue, and green ultra high-power LEDs for étendue-limited applications", Proc. SPIE 12906, Light-Emitting Devices, Materials, and Applications XXVIII, 129060I (13 March 2024); https://doi.org/10.1117/12.3003740
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KEYWORDS
Light emitting diodes
Projection systems
Light sources
Luminous efficiency
Aluminium gallium indium phosphide
Indium gallium nitride
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