Abstract
The authors have investigated radiative recombination in a-P at low temperatures using optically detected magnetic resonance (ODMR) and standard luminescence techniques. The ODMR results show that two distinct regions can be identified in the photoluminescence (PL) spectrum, corresponding to excitonic and pair emissions. The exciton emission has a maximum near 1.1 eV, and the pair emission band peaks near 1.4 eV in bulk a-P material. The results are compared with the existing PL and time-resolved spectroscopy (TRS) date on a-P, and a consistent model can be formed involving exciton and pair recombination at intrinsic centres. From arguments relating to the exciton-pair energy separation, it is inferred that intimate valence alternation pairs (IVAPS) form suitable candidates for the recombination centres.
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