Abstract
The spontaneous emission of light stimulated by temperature change of vacuum-evaporated crystalline layers of N-isopropylcarbazole (NIPC) has been studied between 100 and 300 K. In contrast with typical modes of pyroelectric luminescence of NIPC single crystals, the emission appears below 200 K only and shows a continuous character with two maxima at 140 and 170 K. A theoretical model is presented and the temperature evolution of the luminescence is derived including the effects of electrical discharge in the ambient gas due to high electric fields produced by spontaneous polarisation at fresh microcrystal faces emerging during crystallites cracking on cooling or heating of the layer. Surpass of the strength threshold and stress/temperature-induced phase transitions of microcrystallites are assumed to be physical mechanisms responsible for the cracking. Experimental results from NIPC films are found to be in good agremeent with theoretical predictions of all features of the luminescence pattern.
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