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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

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Front. Optoelectron.    2016, Vol. 9 Issue (4) : 555-559    https://doi.org/10.1007/s12200-015-0533-8
RESEARCH ARTICLE
Junction temperature measurement of alternating current light-emitting-diode by threshold voltage method
Ran YAO1(),Dawei ZHANG1,Bing ZOU1,Jian XU2
1. Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA
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Abstract

Junction temperature of alternating current light-emitting-diode (AC-LED) has a significant effect on its stable light output and lifetime. The threshold voltage measurement is employed to characterize the junction temperature of AC-LED, due to its excellent merits in high efficiency and accuracy. The threshold voltage is measured when the driving current of an AC-LED rises to a reference on-set value from the zero-crossing node. Based on multiple measurements of threshold voltage at different temperatures, a linear relationship was uncovered between the threshold voltage and the junction temperature of AC-LED with the correlating factor of temperature sensitive parameter (TSP). Thereby, we can calculate the junction temperature with the TSP and threshold voltage once the AC-LED stays at thermal equilibrium state. The accuracy of the proposed junction temperature measurement technique was found to be ±3.2°C for the reference current of 1 mA. It is concluded that the method of threshold voltage is accurate and simple to implement, making it highly suitable for measuring the junction temperature of AC-LED in industry.
Keywords optoelectronics      junction temperature measurement      threshold voltage method      alternating current light-emitting-diode (AC-LED)     
Corresponding Author(s): Ran YAO   
Just Accepted Date: 17 September 2015   Online First Date: 26 October 2015    Issue Date: 29 November 2016
 Cite this article:   
Ran YAO,Dawei ZHANG,Bing ZOU, et al. Junction temperature measurement of alternating current light-emitting-diode by threshold voltage method[J]. Front. Optoelectron., 2016, 9(4): 555-559.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0533-8
https://academic.hep.com.cn/foe/EN/Y2016/V9/I4/555
Fig.1  Cycle voltage and current variation of an AC-LED driven by sinusoidal alternating voltage
Fig.2  Cycle forward current under a series of oven temperatures
Fig.3  I-V curve of AC-LED at different junction temperatures
reference threshold current/mA time of self-heating/ms threshold voltage maximum error/V
3 0.87 0.2
1 0.65 0.2
0.5 0.54 0.3
0.1 0.33 0.6
Tab.1  Time of self-heating and threshold voltage maximum error under different reference threshold currents
Fig.4  Correlations between threshold voltages and junction temperatures under different reference threshold currents
number calculated TSP parameter /(V·°C−1) threshold voltage in normal working/V junction temperature/°C
1 0.11 88.2 110.0
2 0.11 88.1 100.9
3 0.11 88.4 98.2
4 0.11 88.3 99.1
5 0.11 88.0 101.8
Tab.2  TSP parameters, threshold voltages and junction temperatures of five experiments with the same sample
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