Chen, Chiung HanChiung HanChenLi, ZhenchaoZhenchaoLiXue, Q.Q.XueSu, Yu AnYu AnSuLee, Chia ChenChia ChenLeeYip, Hin LapHin LapYipWEN-CHANG CHENCHU-CHEN CHUEH2019-09-252019-09-252019-12-0115661199https://scholars.lib.ntu.edu.tw/handle/123456789/425062https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070625443&doi=10.1016%2fj.orgel.2019.105400&partnerID=40&md5=c01a3cf0a1d52ae496c21156927d604a© 2019 Elsevier B.V. Thus far, most of the layered quasi-2D perovskite materials exploited in the perovskite light-emitting diodes (PeLEDs) are based on large-size monoamine cations, which forms a bilayered organic barrier between the perovskite sheets (known as the Ruddlesden-Popper (RP) phase). However, the organic spacer between the perovskite sheets can be composed of a single-layer diamine cation, for which the perovskite sheets might possess a strengthened connection due to the direct linkage of the diamine cation (referred as the Dion-Jacobson (DJ) phase). Until now, the studies of PeLEDs based on the DJ phase 2D perovskite materials are still rare. Herein, a series of DJ phase quasi-2D EDBE(MAPbBr3)n-1PbBr4 perovskites [EDBE: 2,2-(ethylenedioxy)bis(ethylammonium)] is developed and their application in PeLEDs is investigated. Interestingly, different to the broad emission of the 2D EDBEPbBr4 film, the quasi-2D film exhibited a narrow emission, indicating a decreased lattice torsion and trap states. After careful device engineering, a green light-emitting perovskite LED based on the EDBE(MAPbBr3)2PbBr4 film is demonstrated to deliver a maximum luminescence of 1903 cd m−2 and a maximum EQE of 1.06%. We note such performance is inferior to the existing RP phase 2D perovskite, which is limited by the poor thermal stability of the studied EDBE-based 2D perovskites.Thus far, most of the layered quasi-2D perovskite materials exploited in the perovskite light-emitting diodes (PeLEDs) are based on large-size monoamine cations, which forms a bilayered organic barrier between the perovskite sheets (known as the Ruddlesden-Popper (RP) phase). However, the organic spacer between the perovskite sheets can be composed of a single-layer diamine cation, for which the perovskite sheets might possess a strengthened connection due to the direct linkage of the diamine cation (referred as the Dion-Jacobson (DJ) phase). Until now, the studies of PeLEDs based on the DJ phase 2D perovskite materials are still rare. Herein, a series of DJ phase quasi-2D EDBE(MAPbBr3)n-1PbBr4 perovskites [EDBE: 2,2-(ethylenedioxy)bis(ethylammonium)] is developed and their application in PeLEDs is investigated. Interestingly, different to the broad emission of the 2D EDBEPbBr4 film, the quasi-2D film exhibited a narrow emission, indicating a decreased lattice torsion and trap states. After careful device engineering, a green light-emitting perovskite LED based on the EDBE(MAPbBr3)2PbBr4 film is demonstrated to deliver a maximum luminescence of 1903 cd m−2 and a maximum EQE of 1.06%. We note such performance is inferior to the existing RP phase 2D perovskite, which is limited by the poor thermal stability of the studied EDBE-based 2D perovskites. © 2019 Elsevier B.V.Diamine cation | Dion-Jacobson phase | Light-emitting diode | Quasi-2D perovskitesDiamine cation; Dion-Jacobson phase; Light-emitting diode; Quasi-2D perovskitesAmines; Diodes; Light; Light emitting diodes; Positive ions; Sulfur compounds; Thermodynamic stability; Device engineering; Dion-Jacobson phase; Green light; Organic barriers; Organic spacers; Quasi-2d; Ruddlesden-Popper; Single layer; Perovskitejournal articlehttps://api.elsevier.com/content/abstract/scopus_id/8507062544310.1016/j.orgel.2019.1054002-s2.0-85070625443https://api.elsevier.com/content/abstract/scopus_id/85070625443