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The thermal behavior was investigated for the Zn complexes of carbohydrazide and semicarbazide with Sr(NO3)2 and 10% CuO as the oxidizing agent. In both complexes, there was little difference in the various combustion characteristics. The combustion reactivity was relatively low compared with the case of using other oxidizing agents, such as KBrO3, etc. But the participation of CuO in the reaction was supposed to be different based on the analysis of the combustion residue. As for the gas evolution behavior, the evolution of N2, NH3, N2O, NOx and COx gases was confirmed upon ignition at 500°C in both complexes (no H2O analysis). It was interesting that CO gas not evolved from the semicarbazide complex. It was clear that the combustion reactivity and the gas evolution behavior vary in both complexes in spite of the same skeleton and similar oxygen balance.

Miniaturization of the tunable laser equipment is an important factor for further development in various optoelectronic technologies. To realize the compact tunable laser devices, an optical gain medium having a broadband optical gain characteristic is required. In this study, we propose a promising strategy for preparing an optical gain film that exhibits a ∼250 nm gain bandwidth in the visible wavelength region. This film consists of a polymer matrix co-doped with organic luminescent molecules that form a complex of the excited state, i.e., exciplex. The exciplex state can co-exist with the monomolecular exciton state, leading to broadband (400–650 nm) optical gain with a large Stokes shift. Optically pumped lasing action is also possible when the film is combined with an optical resonator. This strategy would be useful for developing a compact tunable laser device without active medium replacement.

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