Organic ultraviolet photodetector based on phosphorescent material.

Area of Science:

• Organic electronics
• Photodetector technology
• Materials science

Background:

• Organic photodetectors (PDs) are crucial for various applications.
• Developing visible-blind UV-PDs with high performance remains a challenge.
• Phosphorescent materials offer unique optoelectronic properties.

Purpose of the Study:

• To demonstrate a new type of organic visible-blind UV-PD.
• To utilize Ir(III)bis[(4,6-difluorophenyl)-pyridinato-N, C(2)'] picolinate (FIrpic) as an electron donor and [6,6]-phenyl-C-61-butyricacidmethylester (PCBM) as an electron acceptor.
• To characterize the performance of the fabricated UV-PDs.

Main Methods:

• Fabrication of organic UV-PDs using FIrpic and PCBM.
• Investigation of photoluminescence quenching by doping PCBM into FIrpic.
• Measurement of photocurrent response, responsivity, external quantum efficiency, rise/fall times, and linearity.

Main Results:

• Achieved peak responsivity of 140 mA/W and external quantum efficiency of ~48% at 365 nm UV light.
• Demonstrated distinct photoluminescence quenching of FIrpic due to PCBM doping.
• Observed visible-blind performance with strong UV-A response, fast response times (<1 s), and linear response from 0.018 to 20 mW/cm(2).

Conclusions:

• The developed organic UV-PDs exhibit excellent visible-blind performance.
• The combination of FIrpic and PCBM is effective for high-performance UV detection.
• These organic UV-PDs show potential for applications requiring sensitive and selective UV detection.