High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes. Issue 12 (December 2018)

• Record Type: Journal Article
• Authors: Zhao, Baodan; Bai, Sai; Kim, Vincent; Lamboll, Robin; Shivanna, Ravichandran; Auras, Florian; Richter, Johannes; Yang, Le; Dai, Linjie; Alsari, Mejd; She, Xiao-Jian; Liang, Lusheng; Zhang, Jiangbin; Lilliu, Samuele; Gao, Peng; Snaith, Henry; Wang, Jianpu; Greenham, Neil; Friend, Richard; Di, Dawei
• Is Part Of: Nature photonics. Volume 12:Issue 12(2018)
• Page Start: 783
• Page End: 789
• Publication Date: 2018-12
• Subjects: Photonics -- Periodicals; 621.36
• DOI: 10.1038/s41566-018-0283-4
• Languages: English
• ISSNs: 1749-4885

Abstract

Abstract 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 (T50 = 46 h in air at peak external quantum efficiency) require further improvement, our results indicate the significant potential of perovskite-based photon sources. Near-infrared perovskite–polymer light-emitting diodes (LEDs) with external quantum efficiencies of up to 20.1% are reported.