Efficient Ruddlesden-Popper Perovskite Light-Emitting Diodes with Randomly Oriented Nanocrystals
- Authors
- Lee, Hyeon-Dong; Kim, Hobeom; Cho, Himchan; Cha, Wonhee; Hong, Yongseok; Kim, Young-Hoon; Sadhanala, Aditya; Venugopalan, Vijay; Kim, Joo Sung; Choi, Jin Woo; Lee, Chang-Lyoul; Kim, Dongho; Yang, Hoichang; Friend, Richard H.; Lee, Tae-Woo
- Issue Date
- Jul-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- carrier transport; nanocrystal orientation; nanocrystal pinning; quasi-2D perovskite; structural modulation
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.29, no.27, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 29
- Number
- 27
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189748
- DOI
- 10.1002/adfm.201901225
- ISSN
- 1616-301X
- Abstract
- Ruddlesden-Popper phase (RP-phase) perovskites that consist of 2D perovskite slabs interleaved with bulky organic ammonium (OA) are favorable for light-emitting diodes (LEDs). The critical limitation of LED applications is that the insulating OA arranged in a preferred orientation limits charge transport. Therefore, the ideal solution is to achieve a randomly connected structure that can improve charge transport without hampering the confinement of the electron-hole pair. Here, a structurally modulated RP-phase metal halide perovskite (MHP), (PEA)(2)(CH3NH3)(m-1)PbmBr3m+1 is introduced to make the randomly oriented RP-phase unit and ensure good connection between them by applying modified nanocrystal pinning, which leads to an increase in the efficiency of perovskite LEDs (PeLEDs). The randomly connected RP-phase MHP forces contact between inorganic layers and thereby yields efficient charge transport and radiative recombination. Combined with an optimal dimensionality, (PEA)(2)(CH3NH3)(2)Pb3Br10, the structurally modulated RP-phase MHP exhibits increased photoluminescence quantum efficiency, from 0.35% to 30.3%, and their PeLEDs show a 2,018 times higher current efficiency (20.18 cd A(-1)) than in the 2D PeLED (0.01 cd A(-1)) and 673 times than in the 3D PeLED (0.03 cd A(-1)) using the same film formation process. This approach provides insight on how to solve the limitation of RP-phase MHP for efficient PeLEDs.
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