title: Blue-Green Color Tunable Solution Processable Organolead Chloride-Bromide Mixed Halide Perovskites for Optoelectronic Applications.
abstract: Solution-processed organo-lead halide perovskites are produced with sharp, color-pure electroluminescence that can be tuned from blue to green region of visible spectrum (425-570 nm). This was accomplished by controlling the halide composition of CH3NH3Pb(BrxCl1-x)3 [0 ≤ x ≤ 1] perovskites. The bandgap and lattice parameters change monotonically with composition. The films possess remarkably sharp band edges and a clean bandgap, with a single optically active phase. These chloride-bromide perovskites can potentially be used in optoelectronic devices like solar cells and light emitting diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs with narrow emission full width at half maxima (FWHM) and low turn on voltages using thin-films of these perovskite materials, including a blue CH3NH3PbCl3 perovskite LED with a narrow emission FWHM of 5 nm.
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Aditya
authors.initials: A
authors.lastname: Sadhanala
authors.affiliation: Department of Engineering, Cambridge University , 17 Charles Babbage Road, CB3 0FS, Cambridge, United Kingdom.
authors.forename: Shahab
authors.initials: S
authors.lastname: Ahmad
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Baodan
authors.initials: B
authors.lastname: Zhao
authors.affiliation: Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München , Butenandtstraße 5-13, 81377 München, Germany.
authors.forename: Nadja
authors.initials: N
authors.lastname: Giesbrecht
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Phoebe M
authors.initials: PM
authors.lastname: Pearce
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Felix
authors.initials: F
authors.lastname: Deschler
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Robert L Z
authors.initials: RL
authors.lastname: Hoye
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Karl C
authors.initials: KC
authors.lastname: Gödel
authors.affiliation: Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München , Butenandtstraße 5-13, 81377 München, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Bein
authors.affiliation: Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München , Butenandtstraße 5-13, 81377 München, Germany.
authors.forename: Pablo
authors.initials: P
authors.lastname: Docampo
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Siân E
authors.initials: SE
authors.lastname: Dutton
authors.affiliation: Department of Engineering, Cambridge University , 17 Charles Babbage Road, CB3 0FS, Cambridge, United Kingdom.
authors.forename: Michael F L
authors.initials: MF
authors.lastname: De Volder
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom.
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend
keywords: Blue perovskite LED; bandgap tuning; chloride bromide perovskite; disorder; narrow FWHM