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A complete analysis of the line shape of the excitonic absorption and photoluminescence lines of the yellow series of Cu2O is given. A detailed fit to the absorption lines up to the n = 5 exciton according to Toyozawa's theory gives precise values for the excitonic resonance energies, allowing to calculate the excitonic Rydberg. The fit to the photoluminescence lines shows very good agreement with experimental data at different temperatures. At high excitation, the fit to the excitonic absorption lines reveals the fundamental mechanism for bleaching of exciton absorption lines in Cu2O. Based on these findings, a new all‐optical method for the observation of exciton transport in Cu2O is proposed.

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The photoluminescence quantum efficiency of the yellow series 1s orthoexciton in Cu 2 O, including its phonon sidebands, was measured in an Ulbricht sphere. The obtained efficiency values between 10 Ϫ4 and 10 Ϫ6 are remarkably low. The nonmonotonous temperature dependence is analyzed.

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