Highly sensitive organic ultraviolet optical sensor based on phosphorescent Cu (I) complex

Ultraviolet light-sensitive organic optical sensor based on photovoltaic diode was demonstrated by using a phosphorescent Cu complex and a diamine derivative as electroacceptor and electrodonor, respectively. The Cu complex is Cu(DPEphos)((Bphen))BF4, in which DPEphos and Bphen denote 6,7-dicyanodipyrido [2,2-d:2('),3(')-f] quinoxaline and bathophenanthroline. And the diamine derivative, m-MTDATA, is 4, 4('),4(')-tris-(2-methylphenyl phenylamino) triphenylamine. The sensor is highly sensitive to UV light band from 300 to 420 nm while it has almost no response to the visible light, and under illumination of 365 nm light with power of 1.7 mW/cm(2), the sensor exhibits an open circuit voltage of 1.86 V, a short circuit current of 105.3 mu A/cm(2), a fill factor of 0.246, and a power conversion efficiency of 2.83%. The dependences of ultraviolet responsive sensitivity on illumination intensity and working temperature were also discussed. (c) 2006 American Institute of Physics.