Polymer infrared proximity sensor

En-Chen Chen; Shin-Rong Tseng; Jia-Hong Ju; Chia-Ming Yang; Hsin-Fei Meng; Sheng-Fu Horng; Ching-Fong Shu
August 2008
Applied Physics Letters;8/11/2008, Vol. 93 Issue 6, p063304
Academic Journal
A proximity sensor that combines a polymer light-emitting diode and a polymer photodiode is presented. The operation wavelength is in the near infrared from 700 to 850 nm. The infrared emission is obtained by adding a color conversion film of polyvinylpyrrolidone polymer matrix blended with infrared dye 1,1-diethyl-2,2-dicarbocyanine iodide to a red polymer light-emitting diode. The photodetector relies on the direct charge-transfer exciton generation in a donor-acceptor polymer blend of poly(3-hexylthiophene) and (6,6)-phenyl-C61-butyric acid methyl ester. The detection distance is up to 19 cm for objects with various colors and roughness under ambient indoor lighting.


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