Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Hybrid lead halide perovskite derivatives that obey to the general formula ABO3 have been extensively employed during the last years for the preparation of high efficiency solar cells (η ≈ 20%). Due to the excellent opto-electronic properties of the CH3NH3PbI3-xClx derivative, e.g. long charge diffusion lengths (L ≥ 1µm), ambipolar conductivity, emission color tunability, relatively high photoluminescence quantum yields on film and narrow emission spectrum, the application of these materials for the preparation of light emitting diodes (LEDs) is becoming of great interest for the scientific community.Here we report on the preparation of all-solution processed light emitting diodes based on lead halide perovskite with enhanced performance; in particular, our devices show outstanding characteristics, taking into account the simplicity of the preparation approach, in terms of external quantum efficiency (EQE), radiance, turn-on voltage and color purity. Nevertheless, our devices suffer from limited stability under continuous operation (50% of the electroluminescence intensity is lost after ≈ 80 minutes at 1.5 V under N2 atmosphere). To the best of our knowledge, this is the first contribution that reports on the stability of lead halide perovskite LEDs and gives a robust explanation for the limited performance. After an exhaustive analysis by means of electrochemical impedance spectroscopy (EIS), we have elucidated the main reasons that provoke the loss of the electroluminescence signal, which paves the way for the development of efficient and long-term stable devices.
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