Leta i Linköpings universitets forskning

På LiU E-Press har vi registrerat de flesta publikationer från LiU. Skriv några nyckelord, välj publikationstyp...

Title
High-efficiency perovskite-polymer bulk heterostructure light-emitting diodes
Article in journal
Authors
Baodan Zhao, Sai Bai, Vincent Kim, Robin Lamboll, Ravichandran Shivanna, Florian Auras, Johannes M. Richter, Le Yang, Linjie Dai, Mejd Alsari, Xiao-Jian She, Lusheng Liang, Jiangbin Zhang, Samuele Lilliu, Peng Gao, Henry J. Snaith, Jianpu Wang, Neil C. Greenham, Richard H. Friend, Dawei Di
Publication Year
2018
Source
Nature Photonics, 2018, (12)12, 783-+
Link to Source (DOI)
10.1038/s41566-018-0283-4
Abstract
<p>Perovskite-based optoelectronic devices are gaining much attention owing to their remarkable performance and low processing cost, particularly for solar cells. However, for perovskite light-emitting diodes, non-radiative charge recombination has limited the electroluminescence efficiency. Here we demonstrate perovskite-polymer bulk heterostructure light-emitting diodes exhibiting external quantum efficiencies of up to 20.1% (at current densities of 0.1-1 mA cm(-2)). The light-emitting diode emissive layer comprises quasi-two-dimensional and three-dimensional (2D/3D) perovskites and an insulating polymer. Photogenerated excitations migrate from quasi-2D to lower-energy sites within 1 ps, followed by radiative bimolecular recombination in the 3D regions. From near-unity external photoluminescence quantum efficiencies and transient kinetics of the emissive layer with and without charge-transport contacts, we find non-radiative recombination pathways to be effectively eliminated, consistent with optical models giving near 100% internal quantum efficiencies. Although the device brightness and stability (T-50 = 46 h in air at peak external quantum efficiency) require further improvement, our results indicate the significant potential of perovskite-based photon sources.</p>