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Health monitoring of LED lighting systems is necessary for some safety critical and emergency applications. Prognostics and health monitoring (PHM) is a method for anomaly detection and remaining useful life (RUL) prediction. In this paper, the LED lighting system was defined as LED lamp which is composed of LED strings and an electrical driver. This paper introduced different PHM approach. An implementation...
In this paper, the main failure modes and mechanisms were investigated through some failure analysis cases, based on this, Subsequent 160°C, 170°C and180°C lifetime tests were completed. According to the method of least squares, the degradation model of high power light emitting diodes is obtained. Using the model and ALTA9 software, the extrapolated lifetime of high power light emitting diode at...
In this paper, the main failure modes and mechanisms were investigated through some failure analysis cases, based on this, Subsequent 160°C, 170°C and180°C lifetime tests were completed. According to the method of least squares, the degradation model of high power light emitting diodes is obtained. Using the model and ALTA9 software, the extrapolated lifetime of high power light emitting diode at...
A fault tree of high power laser diode have been set up, include sudden failure mode, gradual degradation mode, open failure and short failure mode are analyzed in detail with several cases, some methods about improving the reliability of laser diode have been provided subsequently in this paper.
The main failure mechanisms of high power diode lasers such as material defects, mirror damage and solder related failures as well as to methods which significantly suppress the occurrence of catastrophic failure and solder related failures are investigated in this paper. Meanwhile, in order to obtain the lifetime data of high power QCM cm-bar arrays, we have set up an automated diode array reliability...
Light-emitting diodes (LEDS) are a strong candidate for the nest-generation general illumination applications. The reliability of LEDs is the key point for its applications, and the main challenges facing the development of high reliable LED is packaging process. In this paper, the overview of state of the art techniques in LED failure analysis is provided, and the main failure modes such as bonding...
High power semiconductor lasers have found increased applications. Indium solder is one of the most widely used solders in high power laser die bonding, its' reliability is rated as the key parameter deciding about the more or less extensive use of indiun solder die bonding of high power diode arrays. In this paper, 20 samples were tested under two conditions, three degradation modes were observed...
The reliability, long-term performance and lifetime of high power diode lasers are important issues for pumping of solid state and fiber laser systems. In order to obtain the lifetime data of high power QCW 808 nm cm-bars, we have set up a computer controlled diode array reliability experiment which can automated monitor the laser arrays 24 hours a day. Using this setup 10 high power QCW cm-bars currently...
We report here the lifetime testing of 10 high power cm-bar arrays using an automated diode array reliability experiment. The devices are tested at 25degC/100A, with a pulse width of 200 mus and a duty factor of 2%. Most devices survive more than 1.0times109 shots. Failure analysis results on the few failing devices reveal failure modes of mechanical stress, chemical contamination and thermal migration.
Package is a key factor, and affects the reliability of LED. In this paper, the main failure modes and mechanisms that caused by poor package process were investigated through some failure analysis cases, and some improving methods to improve the LED's reliability are put forward.
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