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An explanation for invalidity of working currents' derating on improving light-emitting diode devices' reliability
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10.1063/1.4813092
/content/aip/journal/jap/114/2/10.1063/1.4813092
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813092
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Measured luminous efficiency as a function of forward current of the packaged white LEDs: (a) Brand A; (b) Brand B; (c) schematic drawing of the cross-section structure of the LED chips.

Image of FIG. 2.
FIG. 2.

Light output decay under the aging conditions I and II of LEDs: (a) Brand A and (b) Brand B.

Image of FIG. 3.
FIG. 3.

Semi-log plotting of I-V characteristics of the LEDs of brand A and brand B measured before test at the temperatures: 30 °C and 120 °C.

Image of FIG. 4.
FIG. 4.

I-V characteristics measured at the temperatures 30 °C and 120 °C of the LEDs after stress at conditions I and II: (a) Brand A and (b) Brand B. The reverse voltage parts of I-V curves of LEDs of brand B are deleted due to the usage of a zener diode.

Image of FIG. 5.
FIG. 5.

I-V characteristics measured at the temperatures 30 °C and 120 °C of the LEDs of brand B after stress at condition I. The reverse voltage part is deleted due to the usage of a zener diode.

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/content/aip/journal/jap/114/2/10.1063/1.4813092
2013-07-09
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An explanation for invalidity of working currents' derating on improving light-emitting diode devices' reliability
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813092
10.1063/1.4813092
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