What is it about?
Does pressure reduce or increase efficiency? We found that contrary to established theories which state it should reduce the piezo field and hence increase the efficiency, the opposite occurs. An explanation was found when we tried to predict the fields using non linear models, which give the correct picture.
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Why is it important?
If compressive pressure reduces efficiency, then one can imagine that tensile would increase it. This work both demonstrated the validity and importance of non linear models of the piezo fields together with a suggestion of how to exploit it.
Perspectives
There is a further paper that followed up on this: “Enhancement of Efficiency of InGaN-based LEDs through Strain and Piezoelectric Field Management” J. Pal, M. A. Migliorato, C.-K. Li, H.-R. Wu, B. G. Crutchley, I. P. Marko and S. J. Sweeney, J. Appl. Phys. 114, 073104, pp 1-5 (2013). http://dx.doi.org/10.1063/1.4818794
Dr Max A Migliorato
University of Manchester
Read the Original
This page is a summary of: Optical properties of InGaN-based LEDs investigated using high hydrostatic pressure dependent techniques, physica status solidi (b), March 2013, Wiley,
DOI: 10.1002/pssb.201200514.
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