Remodeling the p-n junction

Damljanović, D.D.

doi:10.1109/101.261890

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…Current measurement approaches of a LEDs' thermal parameters include the IR thermography method [9], the electrical test method [10], the transient thermal measuring method [11,12], the peak shift method, and the optical power method [13]. The electrical test method and transient thermal measuring method are widely used due to their convenience, rapidity and accuracy [14].…”

Section: A Quick Electrical Inspection Methods Of Solder Joint Qualit...mentioning

confidence: 99%

A quick electrical inspection method of solder joint quality for LED products

Zhang

Que

Liu

et al. 2016

Meas. Sci. Technol.

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Solder joint qualities of light-emitting diodes (LED) lamps have a significant effect on their lifetime. Due to variations in LEDs, the product lifetime is determined by the lowest performing component of the product when multi-LEDs are used. In this paper, we propose a quick electrical inspection method of solder joint quality for LED products, which is obtained by the heating curve measurement for a short time with the forward voltage as a temperature sensitive parameter. The utility of this quick inspection method is verified by the measurement of a solder voids ratio based on the most commonly used approaches in the industry-x-ray. The proposed method is cost effective and only needs around 1-5 s for each LED, which is about one third of the x-ray. Therefore, the quick electrical test method is both meaningful and promising especially when carrying out quality tests on large quantities of solder and can be a highly recommended method to be adopted by the LED lighting industry.

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Section: A Quick Electrical Inspection Methods Of Solder Joint Qualit...mentioning

confidence: 99%

A quick electrical inspection method of solder joint quality for LED products

Zhang

Que

Liu

et al. 2016

Meas. Sci. Technol.

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“…For semiconductor LEDs, which are driven in constant current, the dependence of junction voltage on temperature is very close to linear [10], and the operating voltage monotonously decreases when the environment temperature increases , which can approximately be expressed by the following formula (1):…”

Section: Measurement Of Temperature Coefficient Of the Forward Voltagementioning

confidence: 99%

Research on the junction-temperature characteristic of GaN light-emitting diodes on Si substrate

Jiang

Liu

et al. 2007

Journal of Luminescence

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“…The excessive accumulation of junction temperature affects the photoelectric color characteristics of LEDs, the reliability and lifetime of LEDs [2]. The currently accepted method for measuring LED junction temperature is the forward voltage method [3]. However, as a contact method, the LED package structure must be destroyed, resulting in a high cost and limited practicality.…”

Section: Introductionmentioning

confidence: 99%

Prediction of junction temperature of high-voltage white LED based on relative chromaticity parameters

Lei²,

Yang³

et al. 2023

Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022)

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With the improvement of the market's requirements on the color rendering of high-voltage LED light sources, accurately predicting the junction temperature of high-voltage LED, preventing led aging and extending the service life have become a topic worth studying.In this paper, the relationship between the junction temperature and the chromaticity parameters, and the relationship between the chromaticity parameters and the driving current are respectively studied for the blue excited yellow phosphor type highvoltage white LED. Finally, the functional relationship among the junction temperature, the chromaticity parameters and the driving current is established.To further accurately predict the junction temperature of the high-voltage LED.Subtracting the color fidelity R f and color gamut R g of the initial state from the color fidelity and color gamut at the measurement temperature to obtain the relative chromaticity parameters∆R f , ∆R g can eliminate the self heating effect of the current; Subtracting the initial temperature T j from the measured temperature to obtain the relative junction temperature ∆T j can eliminate the temperature deviations introduced by the high temperature chamber.The functional relationship among the relative junction temperature ∆T j and the relative chromaticity parameters ∆R f , ∆R g fitting curve are obtained. For 12V and 6V high-voltage LEDs with the same power, the linearities of the fitting functions of ∆T j -∆R f and ∆T j − ∆R g are close to 1. Compared with the results measured by T3ster, the maximum errors of junction temperature prediction based on color fidelity and color gamut are 3.33% and 4.24% respectively, which are within the acceptable range. It shows that these methods are entirely feasible and has particular practical value.

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Remodeling the p-n junction

Cited by 9 publications

References 7 publications

A quick electrical inspection method of solder joint quality for LED products

A quick electrical inspection method of solder joint quality for LED products

Research on the junction-temperature characteristic of GaN light-emitting diodes on Si substrate

Prediction of junction temperature of high-voltage white LED based on relative chromaticity parameters

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