Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201904101
Keywords
charge injection; EQE roll-off; LEDs lifetime; perovskite light emission; perovskite optoelectronics
Categories
Funding
- European Research Council under the European Horizon 2020 Programme/ERC grant [835133]
- FWO [12Z4618N]
- VW Foundation
- bilateral Lithuanian-Ukrainian cooperation project [M/72-2018]
- National Academy of Science of Ukraine [VC/202]
- European Research Council (ERC) [835133] Funding Source: European Research Council (ERC)
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Perovskite light emitting diodes (PeLEDs) have reached external quantum efficiencies (EQEs) over 21%. Their EQE, however, drops at increasing current densities (J) and their lifetime is still limited to just a few hours. The mechanisms leading to EQE roll-off and device instability require thorough investigation. Here, improvement in EQE, EQE roll-off, and lifetime of PeLEDs is demonstrated by tuning the balance of electron/hole transport into a mixed 2D/3D perovskite emissive layer. The mixed 2D/3D perovskite layer induces exciton confinement and beneficially influences the electron/hole distribution inside the perovskite layer. By tuning the electron injection to match the hole injection in such active layer, a nearly flat EQE for J = 0.1-200 mA cm(-2), a reduced EQE roll-off until J = 250 mA cm(-2), and a half-lifetime of approximate to 47 h at J = 10 mA cm(-2) is reached. A model is also proposed to explain these improvements that account for the spatial electron/hole distributions.
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