Publications [#325478] of Henry Everitt

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Papers Published
  1. Peng, H; Lee, C-W; Everitt, HO; Munasinghe, C; Lee, DS; Steckl, AJ, Spectroscopic and energy transfer studies of Eu3+ centers in GaN, Journal of Applied Physics, vol. 102 no. 7 (October, 2007), pp. 073520-073520 [nph-data_query], [doi] .

    Abstract:
    Photoluminescence (PL), photoluminescence excitation (PLE), and time-resolved PL spectroscopies have been carried out at room temperature and 86 K on transitions from 5D2, 5D1, and 5D0 excited states to numerous 7FJ ground states of Eu-doped GaN films grown by conventional solid-source molecular beam epitaxy (MBE) and interrupted growth epitaxy MBE. Within the visible spectral range of 1.8-2.7 eV, 42 spectral features were observed and assignments were attempted for each transition. PL and PLE indicate that four Eu3+ centers exist in the GaN lattice whose relative concentration can be controlled by the duration of growth interruption. The energy levels for these four sites are self-consistently obtained, and time-resolved photoluminescence measurements reveal details about the radiative and nonradiative relaxations of excitation among these levels. The data indicate a near-resonant cross relaxation among these sites. The 5D2 and 5D1 states are observed to decay nonradiatively by filling the 5D0 state with characteristic times of 2.4 and 2.8 $\mu$s, respectively. The 5D0 state is found to relax in a manner that depends slightly on the final state and dopant site.