Highly efficient low color temperature organic LED using blend carrier modulation layer

Yao-Ching Hsieh; Szu-Hao Chen; Shih-Ming Shen; Ching-Chiun Wang; Chien-Chih Chen; Jwo-Huei Jou

doi:10.1117/12.974643

15 October 2012 Highly efficient low color temperature organic LED using blend carrier modulation layer

Yao-Ching Hsieh, Szu-Hao Chen, Shih-Ming Shen, Ching-Chiun Wang, Chien-Chih Chen, Jwo-Huei Jou

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 84192C (2012) https://doi.org/10.1117/12.974643
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

Color temperature (CT) of light has great effect on human physiology and psychology, and low CT light, minimizing melatonin suppression and decreasing the risk of breast, colorectal, and prostate cancer. We demonstrates the incorporation of a blend carrier modulation interlayer (CML) between emissive layers to improve the device performance of low CT organic light emitting diodes, which exhibits an external quantum efficiency of 22.7% and 36 lm W^-1 (54 cd A^-1) with 1880 K at 100 cd m^-2, or 20.8% and 29 lm W^-1 (50 cd A^-1) with 1940 K at 1000 cd m^-2. The result shows a CT much lower than that of incandescent bulbs, which is 2500 K with 15 lmW^-1 efficiency, and even as low as that of candles, which is 2000 K with 0.1 lmW^-1. The high efficiency of the proposed device may be attributed to its CML, which helps effectively distribute the entering carriers into the available recombination zones.

Citation Download Citation

Yao-Ching Hsieh, Szu-Hao Chen, Shih-Ming Shen, Ching-Chiun Wang, Chien-Chih Chen, and Jwo-Huei Jou "Highly efficient low color temperature organic LED using blend carrier modulation layer", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84192C (15 October 2012); https://doi.org/10.1117/12.974643

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KEYWORDS

Modulation

Organic light emitting diodes

External quantum efficiency

Light sources and illumination

Light emitting diodes

Human physiology

Breast

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