Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

Tsung Hsun Yang, Hsu Yi Huang, Ching Cherng Sun, Benoît Glorieux, Xuan Hao Lee, Yeh Wei Yu, Te Yuan Chung

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Phosphor-converted white light-emitting diodes (pc-WLEDs) have become a major light source in general lighting. To stabilize the photometric characteristics of pc-WLEDs, much effort has been made to manage the heat dissipation of the LED dies. The thermal problems of the phosphor parts, a critical reliability concern for pc-WLEDs, have recently attracted academic interest. This study 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. Conventionally, an infrared camera or thermocouples have been used to measure temperature. An IR camera requires good calibration on the emissivity and is usually blocked by the lens or other components covered on the phosphors. Moreover, a thermocouple requires time to reach the thermal equivalence between the detector and the sample under testing, and this approach is destructive when used for inner detection. Our approach has advantages over the conventional methods because it is noninvasive, noncontact, and instant, and inner detection. The approach is also independent of the peak wavelength of pumping lights, the concentration and thickness of phosphor, and correlated color temperatures.

Original languageEnglish
Article number296
JournalScientific Reports
Volume8
Issue number1
DOIs
StatePublished - 1 Dec 2018

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