Rapid crystallization-driven high-efficiency phase-pure deep-blue Ruddlesden–Popper perovskite light-emitting diodes  

作　　者：Gyumin Jang Hyowon Han Sunihl Ma Junwoo Lee Chan Uk Lee Wooyong Jeong Jaehyun Son Dongki Cho Ji-Hee Kim Cheolmin Park Jooho Moon 

机构地区：[1]Yonsei University,Department of Materials Science and Engineering,Seoul,Republic of Korea [2]Sungkyunkwan University,Department of Energy Science,Suwon,Republic of Korea [3]Institute for Basic Science,Center for Integrated Nanostructure Physics,Suwon,Republic of Korea

出　　处：《Advanced Photonics》2023年第1期8-18,共11页先进光子学（英文）

基　　金：National R&D Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(Grant Nos.2018M3D1A1058793 and 2021R1A3B1068920);the Yonsei Signature Research Cluster Program of 2021(Grant No.2021-22-0002).

摘　　要：Perovskite light-emitting diodes(PeLEDs)are considered as promising candidates for nextgeneration solution-processed full-color displays.However,the external quantum efficiencies(EQEs)and operational stabilities of deep-blue(<460 nm)PeLEDs still lag far behind their red and green counterparts.Herein,a rapid crystallization method based on hot-antisolvent bathing is proposed for realization of deep-blue PeLEDs.By promoting immediate removal of the precursor solvent from the wet perovskite films,development of the quasi-two-dimensional(2D)Ruddlesden–Popper perovskite(2D-RPP)crystals with n values>3 is hampered completely,so that phase-pure 2D-RPP films with bandgaps suitable for deep-blue PeLEDs can be obtained successfully.The uniquely developed rapid crystallization method also enables formation of randomly oriented 2D-RPP crystals,thereby improving the transfer and transport kinetics of the charge carriers.Thus,high-performance deep-blue PeLEDs emitting at 437 nm with a peak EQE of 0.63%are successfully demonstrated.The color coordinates are confirmed to be(0.165,0.044),which match well with the Rec.2020 standard blue gamut and have excellent spectral stability.

关 键 词：Ruddlesden–Popper perovskite rapid crystallization deep-blue light-emitting diodes phase purity randomly oriented crystals 

分 类 号：TN383.1[电子电信—物理电子学]