High response organic ultraviolet photodetector based on bis (2-methyl-8-quinolinato)-4-phenylphenolate aluminum

• Published in: Synthetic metals Vol. 160; no. 5; pp. 373 - 375
• Main Authors: Cui, Yuncheng, Liu, Lihui, Liu, Chunbo, Wang, Qingwei, Li, Wenlian, Che, Guangbo, Xu, Chunhui, Liu, Mei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2010; Elsevier
• Subjects: Applied sciences; BAlq; Electronics; Exact sciences and technology; General equipment and techniques; High response; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Optoelectronic devices; Organic ultraviolet photodetector; Photoluminescence quenching; Physics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; High response; Organic ultraviolet photodetector; BAlq; Photoluminescence quenching; Phenolate; Radiation detectors; Nitrogen heterocycle; Photoluminescence; Organic ligand; Quinoline derivatives; Ultraviolet detectors; Photoinduced effect; Photodetectors; Response functions; Sensor materials; Aluminium Compounds; Charge transfer; Donor acceptor interaction
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2009.11.007

We report highly efficient visible-blind ultraviolet photodetectors based on 1,3,5-tris(3-methylphenyl-phenylamino)-triphenyamine (m-MTDATA) as donor and bis(2-methyl-8-quinolinato)-4-phenylphenolate aluminum (BAlq) as acceptor. Strong photoluminescence quenching of m-MTDATA by BAlq is observed manifesting the efficient photoinduced charge transfer occurs between m-MTDATA and BAlq. The optimized device exhibits a photocurrent of 172 μA/cm 2 at −14 V under an illumination of 365 nm UV light irradiation with an intensity of 0.691 mW/cm 2, corresponding to a responsivity of 248 mA/W. We attribute the high response to the efficient electron transfer from the donor to the acceptor, the feasible level alignment match and the high carrier mobility of photoresponsive materials.