electroluminescence cells with H[3,4-b]chinoline and 9winylecarbazole [PAQ] layers are promising devices for blue light emitting EL diode. In this work optical reflectance as a function of temperature in copolymers PAQ layers deposited on Si crystalline substrate was measured. Using the Cauchy model of reflectance versus wavelength the refraction coefficient and thickness of the films were determined in temperature ranges from 76 K to 300 K.

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