An organic composition is provided which comprises a non-polymeric charge transport material being one of a hole transport material and an electron transport material; a polymeric charge transport material being one of a hole transport material and an electron transport material; and a charge generation material. Specifically, the organic composition can comprise between 1% to 10% of low-molecular weight hole transport material in the form of titanyl oxyphtalocyanine (TiOPc); between 50% to 70% of polymeric hole transport material in the form of triphenyldiamin; and between 10% to 50% of charge generation material in the form of polyvinylcarbazol. The invention may provide an optical sensor element which allows a combination of advantageous physical, electrical and optical properties. In particular, the properties may be suitable for a low cost printing manufacturing process using a printing ink generated by dissolving the organic composition in a suitable solvent.