| Autor: |
Torre Cachafeiro, Miguel Angel, Kumar Kumawat, Naresh, Gao, Feng, Tress, Wolfgang |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Popis: |
In perovskite light-emitting diodes (PeLEDs), the slow response of mobile ions can have an important effect under pulsed operation. In a study by Kumawat et al. , the operation of near infra-red (NIR) PeLEDs was investigated under pulsed operation in the frequency range of 10 Hz up to 20 kHz. The transient electroluminescence (TrEL) of highly efficient devices was measured with varying pulse widths (duty cycle). The TrEL signal was found to show pulse-width dependent features attributed to the characteristic response times of mobile ions. It showed a constant plateau value after turn-on, with lower intensity for lower duty cycles. A large TrEL overshoot was observed at the end of the voltage pulse – which decreased and eventually disappeared with increasing duty cycle. Such TrEL overshoot was previously re-ported for perovskite solar cells and attributed to ionic accumulation effects . In the follow-up simulation study presented in this talk, a model built in the drift-diffusion simulation software Setfos 5.2 (Fluxim) has been used to better understand the role of mobile ions in the TrEL response of PeLEDs under pulsed operation. The results obtained can explain the duty-cycle dependance of the TrEL signal and confirm the slow response of mobile ions as a governing factor, which is important to consider for the development of PeLED-based tech-nologies. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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