A physicist who measured the fundamental band gap of gallium nitride using photoluminescence excitation. When suitable transmission samples were unavailable, varying the excitation and observing emission provided another route to the absorption edge. Combining those measurements with reflection and luminescence separated exciton transition energies from the underlying band gap.[ref]
Fundamental energy gap of GaN from photoluminescence excitation spectra by Bo Monemar. Abstract: motivation for excitation spectroscopy and combined determination of exciton transitions and band gap
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