CCT stabilization and phosphor temperature detection in pc-WLEDs

Tsung-Hsun Yang; Hsu-Yi Huang; Hsin-Mei Wu; Xuan-Hao Lee; Yeh-Wei Yu; Ching-Cherng Sun

doi:10.1117/12.2320098

17 September 2018 CCT stabilization and phosphor temperature detection in pc-WLEDs

Tsung-Hsun Yang, Hsu-Yi Huang, Hsin-Mei Wu, Xuan-Hao Lee, Yeh-Wei Yu, Ching-Cherng Sun

Proceedings Volume 10745, Current Developments in Lens Design and Optical Engineering XIX; 107450M (2018) https://doi.org/10.1117/12.2320098
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

A novel method to stabilize the correlated color temperature in pc-WLEDs from their initial turn-on state to thermal equilibrium is proposed and demonstrated. Under the normal operation condition, it can stabilize the CCT of a pc-WLED by the positive matching of the blue LED peak wavelength to the phosphor excitation spectrum. In the experiments, the CCT variation could be as small as from 7 K to 83 K in different cases. In addition, this study also proposed a practical approach for measuring phosphor temperature in an operating pc- WLED using a noncontact, instant detection method to remotely monitor the emission spectrum. The approach is also independent of the peak wavelength of pumping lights, the concentration and thickness of phosphor, and correlated color temperatures. Firstly, a novel method to stabilize the correlated color temperature in pc-WLEDs from their initial turn-on state to thermal equilibrium is proposed and demonstrated. In the experiments, the CCT variation could be as small as from 7 K to 83 K in different cases. Secondly, this study also proposed a practical approach for measuring phosphor temperature in an operating pc-WLED using a noncontact, instant detection method. The approach is also independent of the peak wavelength of pumping lights, the concentration and thickness of phosphor, and correlated color temperatures.

Citation Download Citation

Tsung-Hsun Yang, Hsu-Yi Huang, Hsin-Mei Wu, Xuan-Hao Lee, Yeh-Wei Yu, and Ching-Cherng Sun "CCT stabilization and phosphor temperature detection in pc-WLEDs", Proc. SPIE 10745, Current Developments in Lens Design and Optical Engineering XIX, 107450M (17 September 2018); https://doi.org/10.1117/12.2320098

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KEYWORDS

Light emitting diodes

Blue light emitting diodes

Temperature metrology

External quantum efficiency

Thermal effects

Light sources

Quenching (fluorescence)

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