What is it about?
Under high pressure the light emitted by the diodes changes color (emission wavelength). The paper analyses such shifts of emission (under two types of stress) and compares it with calculations. The experimental method is photocurrent which is the least perturbing technique for determining energy transitions in the diode (compared e.g. to photoluminescence or electroluminescence which pump large quantity of carriers into the diode). We are able to distinguish transition energies in two polarizations of light (TE and TM) using photocurrent.
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Why is it important?
Blue emitting diodes (and blue laser diodes) are applied in many areas of technology, medicine, general lighting. Therefore it is interesting to what extent their properties might be modified by strain.
Perspectives
We plan to perform more measurements, especially under uniaxial strain. For example, the effect of uniaxial strain on dielectric constant has not been measured for these materials, while this constant determines many optical and electrical properties.
Witold Trzeciakowski
Institute of High Pressure Physics
Read the Original
This page is a summary of: Photocurrent measurements of InGaN/GaN quantum wells under hydrostatic and uniaxial pressure, Journal of Applied Physics, March 2019, American Institute of Physics,
DOI: 10.1063/1.5090099.
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