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Graphdiyne (GDY) is an artificial carbon allotrope that is conceptually similar to graphene but composed of sp‐ and sp2‐hybridized carbon atoms. Monolayer GDY (ML‐GDY) is predicted to be an ideal 2D semiconductor material with a wide range of applications. However, its synthesis has posed a significant challenge, leading to difficulties in experimentally validating theoretical properties. Here, it...
The degradation and failure mechanisms of nitride phosphor in GaN‐based white LEDs are studied using an in situ multi‐functional accelerated life test and different analytical technologies. The electroluminescence results show that both the intensities of the blue emission (BL) from the LED chips and the yellow emission (YL) from the phosphors decrease with the stress time increasing. However, the...
Highly stress tests were carried out for GaN-based high power white LEDs with different structures, including traditional lateral, vertical as well as flip-chip LEDs. During the tests, all the electrical, optical and thermal properties were measured in-situ for each LED. The results show that for lateral LEDs, the structure property of LED epitaxial layer is still the key factor that influences the...
We have fabricated three types of high power LEDs with different circuit boards: Al2O3 ceramic board, epoxy PCB with Cu-deposited on the wall of holes and epoxy PCB with Cu-filled through holes. The different contribution of the package have been separated and investigated by using the derivative of temperature rise in the time domain and thermal transient method. The results show that although the...
The degradation behaviors of GaN-based LEDs encapsulated with different phosphors were studied. The results of the aging experiments show that the yellow phosphor is the most stable phosphor, although the green and red phosphors can help to improve the color quality, they strongly influence the reliability. Comparing the accelerating factors, such as the aging temperature and relatively humidity,...
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