Nonresonant exponential amplification of the excited-state intramolecular proton transfer (ESIPT) emission has been investigated with the film of ESIPT dendrimer (QG2) by pico- and femtosecond laser experiments. The intrinsic four-level nature of ESIPT and the reduced concentration quenching by dendritic effect made QG2 film an optical gain medium with the threshold intensity lower than 20 μJ/cm 2 /pulse. The characteristics of emission amplification are discussed in terms of the amplified spontaneous emission (ASE) related with ESIPT.
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Kim et al. (2002) studied this question.
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