White Electroluminescence from Perovskite–Organic Heterojunction

Natalia Yantara^a, Nur Fadilah Jamaludin^a, David Giovanni^c, Benny Febriansyah^a, Yeow Boon Tay^b, Teddy Salim^d, Tze Chien Sum^c, Subodh Mhaisalkar^a^,^b, Nripan Mathews^a^,^b

^aEnergy Research Institute @ NTU, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore

^bSchool of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore

^cDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore

^dFacility for Analysis, Characterisation, Testing and Simulation (FACTS), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#PerNC22. Colloidal Metal Halide Perovskite Nanocrystals: From Synthesis to Applications

Online, Spain, 2022 March 7th - 11th

Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Osman Bakr

Contributed talk, Natalia Yantara, presentation 309
DOI: https://doi.org/10.29363/nanoge.nsm.2022.309
Publication date: 7th February 2022

Despite extensive reports on red and green perovskite-based LEDs (PeLEDs), development of white PeLEDs remains limited by the low photoluminescence quantum yield of white-emitting perovskites and the undesired energy-transfer (ET) process occurring in multidomain Ruddlesden–Popper perovskites. While ET is beneficial for achieving efficient monochromatic emissions, the broadband spectrum required for white electroluminescence makes this phenomenon undesirable. Processing-induced physical separation of emitters has been proposed as an effective way to curb ET. Here, it is shown that by adopting a bilayered emitter configuration, achieved through a facile antisolvent-assisted spin-coating process, an increase in spatial separation between the blue perovskite and red emitting organic species employed can be realized. This, in turn, has allowed for effective reduction of ET efficiency, leading to a record efficiency of 1.3%, the highest achieved to date from a perovskite-based white electroluminescent device.

References:

[1] ACS Energy Lett. 2020, 5, 8, 2690–2697

Acknowledgements:

This research was funded by National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Programme (CRP Award No. NRF-CRP14-2014-03) and the Intra-CREATE Collaborative Grant (NRF2018-ITC001-001). T.C.S. and D.G. acknowledge the support from the Ministry of Education AcRF Tier 1 grant (RG91/19) and Tier 2 grant MOE2017-T2-1-001 as well as the NRF Investigatorship NRF-NRFI-2018-04. The authors acknowledge the Facility for Analysis, Characterization, Testing and Simulation (FACTS), Nanyang Technological University, Singapore, for the X-ray characterization and depth profiling using XRD and AES, respectively.

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