Abstract
AbstractElectroluminescence studies of n‐GaP (100) and (111) surfaces have been carried out by hole injection using the cationic components of two selected redox systems, 10‐methylphenothiazine (10‐MP/10‐MP+*) and thianthrene (Th/Th+*). The luminescence has been studied as a function of electrode potential at cathodic bias. The results are quantitatively in good agreement with expectations based on band edge positions, determined from differential capacitance data. In contrast to the behaviour observed in aqueous solution, stable luminescence has been observed over a wide range of negative potentials. This is believed to be a consequence of avoiding the surface transformation which occurs in connection with the reduction of protons, generating efficient centers for radiationless recombination. The spectral distribution of the emitted light suggests that the luminescence originates from the same sub‐band‐gap transitions as reported from aqueous studies.
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