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Combined detectors based on crystalline p-terphenyl for detection of UV-radiation

 

Efficiency and availability of instruments for detection of UV-radiation is determined by low cost of photocells, stability of the materials used for conversion of UV radiation to light, and the degree of matching between spectral sensitivity of the photocells and the luminescence spectrum of the converter. To obtain this, we used crystalline p-terphenyl as converting material, which is stable to radiation and has high spectrum-shifting ability. However, the luminescence maximum of p-terphenyl is in the range of 380....390-nm. Standard photocells for this spectral region are rather expensive. Photocells with spectral sensitivity above 500 nm are available. The required shifting of the luminescence maximum of the converter was obtained by its p-terphenyl doping. Possibilities of conversion to longer wavelength range were also studied, when luminophor molecules were doping into compositions, and thereby optical matching between the p-terphenyl crystal and the photocell was created. Spectral characteristics for converters, as well as current-voltage characteristics of the combined detectors are presented. Prospects are shown of the use of p-terphenyl as a converter of UV radiation.

  Source: ICEPOM-3: International Conference on Electronic Processes in Organic Materials No3, Kharkiv , UKRAINE (22/05/2000)



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