Improved transient electroluminescence technique based on time-correlated single-photon counting technology to evaluate organic mobility  

作　　者：Xianfeng Qiao Shu Xiao· Peisen Yuan Dezhi Yang Dongge Ma 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Frontiers of Optoelectronics》2022年第1期121-127,共7页光电子前沿（英文版）

基　　金：The authors acknowledge the funding from the National Natural Science Foundation of China(Grant Nos.91833304,61975057,and 21788102);the National Key R&D Program of China(No.2020YFA0714604);the Foundation of Guangdong Province(No.2019B121205002);the Guangdong Province Key Laboratory of Luminescence from Molecular Aggregates(No.2019B030301003);by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF016).

摘　　要：The transient electroluminescence(EL)technique is widely used to evaluate the carrier mobility in the field of organic light emitting diodes.The traditional analog detection strategy using oscilloscopes is generally limited since the background noise causes an underestimation of the mobility value.In this paper,we utilize time-correlated single-photon counting(TCSPC)to probe the transient EL for mobility calculation.The measurements on tris(8-hydroxyquinoline)aluminum(Alq3)show that the electron mobilities obtained using the TCSPC technique are slightly higher than those obtained from the analog method at all the investigated voltages.Moreover,the TCSPC mobilities demonstrate weaker dependence on the root of electrical field compared to the oscilloscope mobilities.These improvements are attributed to the unique principle of TCSPC,which quantifies the EL intensity by counting the number of single-photon pulses,improving its single-photon sensitivity and elimi-nating the negative impacts of electrical noise.These advantages make TCSPC a powerful technique in the characterization of time-resolved electroluminescence.

关 键 词：MOBILITY Transient electroluminescence(EL) Time-correlated single-photon counting(TCSPC) Sensitivity Signal-to-noise ratio(SNR) Device 

分 类 号：TN312.8[电子电信—物理电子学]