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Color temperature tunable white-light LED cluster with extrahigh color rendering index
Minhao Zhang1, Yu Chen2, Guoxing He1
1Department of Applied Physics, Dong Hua University, 1882 Yan'an Road (W), Shanghai 200051, China.
Thescientificworldjournal
|March 1, 2014
Summary
Researchers developed a tunable white-light LED cluster with excellent color rendering. This device achieves high color rendering index (CRI) and luminous efficacy across a wide range of correlated color temperatures (CCTs).
Area of Science:
- Solid-state lighting
- Optoelectronics
- Color science
Background:
- LEDs are crucial for modern lighting.
- Achieving high color rendering and tunable correlated color temperature (CCT) simultaneously in white-light LEDs remains a challenge.
Purpose of the Study:
- To design and fabricate a white-light LED cluster capable of tunable CCT with superior color rendering properties.
- To evaluate the performance of the fabricated LED cluster in terms of CCT, color rendering index (CRI), and luminous efficacy.
Main Methods:
- Simulation and fabrication of a multi-chip LED cluster.
- The cluster comprises three warm white (WW) LEDs, one red LED, one green LED, and one blue LED.
- Experimental characterization of the cluster's optical and colorimetric properties.
Main Results:
- The fabricated LED cluster successfully produced tunable white-light across a broad CCT range (2719 K to 6497 K).
- Achieved a color rendering index (CRI) exceeding 93.
- Maintained a special CRI R9 (for red) above 90 and an average of special CRIs R9-R12 above 83.
- Demonstrated luminous efficacies greater than 70 lm/W.
Conclusions:
- The developed LED cluster effectively achieves tunable CCT white light with exceptionally high color rendering.
- This technology offers a promising solution for applications requiring high-quality, adaptable illumination.
