Photoluminescence studies of a perceived white light emission from a monolithic InGaN/GaN quantum well structure

Ben Sedrine, N. and Esteves, T. C. and Rodrigues, J. and Rino, L. and Correia, M. R. and Sequeira, M. C. and Neves, A. J. and Alves, E. and Boćkowski, M. and Edwards, P. R. and O'Donnell, K.P. and Lorenz, K. and Monteiro, T. (2015) Photoluminescence studies of a perceived white light emission from a monolithic InGaN/GaN quantum well structure. Scientific Reports, 5. 13739. ISSN 2045-2322 (https://doi.org/10.1038/srep13739)

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Abstract

In this work we demonstrate by photoluminescence studies white light emission from a monolithic InGaN/GaN single quantum well structure grown by metal organic chemical vapour deposition. As-grown and thermally annealed samples at high temperature (1000 °C, 1100 °C and 1200 °C) and high pressure (1.1 GPa) were analysed by spectroscopic techniques, and the annealing effect on the photoluminescence is deeply explored. Under laser excitation of 3.8 eV at room temperature, the as-grown structure exhibits two main emission bands: a yellow band peaked at 2.14 eV and a blue band peaked at 2.8 eV resulting in white light perception. Interestingly, the stability of the white light is preserved after annealing at the lowest temperature (1000 °C), but suppressed for higher temperatures due to a deterioration of the blue quantum well emission. Moreover, the control of the yellow/blue bands intensity ratio, responsible for the white colour coordinate temperatures, could be achieved after annealing at 1000 °C. The room temperature white emission is studied as a function of incident power density, and the correlated colour temperature values are found to be in the warm white range: 3260–4000 K.

ORCID iDs

Ben Sedrine, N., Esteves, T. C., Rodrigues, J., Rino, L., Correia, M. R., Sequeira, M. C., Neves, A. J., Alves, E., Boćkowski, M., Edwards, P. R. ORCID logoORCID: https://orcid.org/0000-0001-7671-7698, O'Donnell, K.P. ORCID logoORCID: https://orcid.org/0000-0003-3072-3675, Lorenz, K. and Monteiro, T.;
  • Item type:Article
    ID code:54228
    Dates:
    Date
    Event
    2015
    Published
    4 September 2015
    Published Online
    4 August 2015
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:09 Sep 2015 09:10
    Last modified:11 Nov 2024 11:09
    URI:https://strathprints.strath.ac.uk/id/eprint/54228
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