Title: Effect of temperature and voltage on LED luminaries reliability

Authors: D.J. Liu; D.G. Yang; Miao Cai; B.Y. Wu; Xiuwen Yang; Jian Liu; Ping Yang

Addresses: Laboratory of Advanced Design, Manufacturing and Reliability for MEMS/NEMS/ODES, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China. ' Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology, School of Mechanism and Electrical Engineering, Guilin University of Electronic Technology, No. 1 Jinji Road, Guilin 541004, China. ' Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology, School of Mechanism and Electrical Engineering, Guilin University of Electronic Technology, No. 1 Jinji Road, Guilin 541004, China. ' Flextronics Manufacturing Company, Zhuhai 519180, China. ' Laboratory of Advanced Design, Manufacturing and Reliability for MEMS/NEMS/ODES, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China. ' Laboratory of Advanced Design, Manufacturing and Reliability for MEMS/NEMS/ODES, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China. ' Laboratory of Advanced Design, Manufacturing and Reliability for MEMS/NEMS/ODES, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Abstract: In this paper, the reliability of LED luminaries system after thermal-ageing test was investigated with experimental test and numerical method. Samples were aged at 45°C, 85°C and 95°C using step-stress accelerated test. The thermal resistance was measured and the failure modes were verified. After 1,692 hours, four categories of failure modes were found and main failure mechanism was analysed. The total thermal resistance of sample C and D increased by 3.24 K/W and 5.09 K/W. The thermal stress is about 687 MPa, 1,106 MPa and 1,116 MPa at different ageing temperature.

Keywords: LED luminaries; step-stress accelerated test; failure modes; thermal resistance; temperature; voltage; reliability; thermal stress.

DOI: 10.1504/IJMSI.2012.049960

International Journal of Materials and Structural Integrity, 2012 Vol.6 No.2/3/4, pp.270 - 283

Published online: 18 Sep 2014 *

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