Journal
FRONTIERS OF OPTOELECTRONICS
Volume 15, Issue 1, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s12200-022-00021-8
Keywords
Mobility; Transient electroluminescence (EL); Time-correlated single-photon counting (TCSPC); Sensitivity; Signal-to-noise ratio (SNR); Device
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Funding
- National Natural Science Foundation of China [91833304, 61975057, 21788102]
- National Key R&D Program of China [2020YFA0714604]
- Foundation of Guangdong Province [2019B121205002]
- Guangdong Province Key Laboratory of Luminescence from Molecular Aggregates [2019B030301003]
- Open Project Program of Wuhan National Laboratory for Optoelectronics [2019WNLOKF016]
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This paper introduces a method for calculating carrier mobility in transient electroluminescence using time-correlated single-photon counting (TCSPC) technique. The experiment shows that the electron mobility obtained using TCSPC technique is slightly higher than that obtained from traditional analog method, and it has weaker dependence on the root of electrical field.
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 (Alq(3)) 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 eliminating the negative impacts of electrical noise. These advantages make TCSPC a powerful technique in the characterization of time-resolved electroluminescence.
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