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Abstract
CuBr films grown on KBr crystals show 102 or 103 times higher efficiency of free-exciton photoluminescence (PL) than those grown on conventional substrates such as Al2O3 or silica glass. The efficiency exceeds even that of CuCl films by a factor of several tens, despite the general recognition that the free-exciton PL from CuBr is much weaker than that from CuCl. The present result encourages the authors to challenge to rethink the exciton PL in CuBr as well as in CuCl, because the compounds are the model materials for basic and application studies of linear/nonlinear exciton-related PL properties of solids.
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