| Autor: |
Ruschel, J., Glaab, J., Brendel, M., Rass, J., Stölmacker, C., Lobo-Ploch, N., Kolbe, T., Wernicke, T., Mehnke, F., Enslin, J., Einfeldt, S., Weyers, M., Kneissl, M. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2018, Vol. 124 Issue 8, pN.PAG-N.PAG, 7p, 1 Diagram, 11 Graphs |
| Abstrakt: |
The degradation behavior of ultraviolet-B light emitting diodes (UV-B LEDs) emitting near 310 nm has been investigated and a method to localize the degradation effects is presented. Measurements of the electro-optical characteristics of UV-B LEDs, during a 200 h constant-current degradation study, showed an initial fast decrease in the optical power accompanied by a decrease in the drive voltage and an increase in the capacitance. Furthermore, by using a specially designed contact geometry, it was possible to separate the degradation of the electrical properties of the p-layers and p-contacts from the degradation of the active region and n-side of the LED heterostructure. Our investigations show that the initial changes in capacitance and voltage can be attributed to changes in the p-side and at the p-contact of the LED, which can be explained by an activation of Mg dopants. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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