title: Inorganic Halide Perovskites for Efficient Light-Emitting Diodes.
abstract: Lead-halide perovskites have transcended photovoltaics. Perovskite light-emitting diodes (PeLEDs) emerge as a new field to leverage on these fascinating semiconductors. Here, we report the first use of completely inorganic CsPbBr3 thin films for enhanced light emission through controlled modulation of the trap density by varying the CsBr-PbBr2 precursor concentration. Although pure CsPbBr3 films can be deposited from equimolar CsBr-PbBr2 and CsBr-rich solutions, strikingly narrow emission line (17 nm), accompanied by elongated radiative lifetimes (3.9 ns) and increased photoluminescence quantum yield (16%), was achieved with the latter. This is translated into the enhanced performance of the resulting PeLED devices, with lower turn-on voltage (3 V), narrow electroluminescence spectra (18 nm) and higher electroluminescence intensity (407 Cd/m(2)) achieved from the CsBr-rich solutions.
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.
authors.forename: Natalia
authors.initials: N
authors.lastname: Yantara
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.
authors.forename: Saikat
authors.initials: S
authors.lastname: Bhaumik
authors.affiliation: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore.
authors.forename: Fei
authors.initials: F
authors.lastname: Yan
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.
authors.forename: Dharani
authors.initials: D
authors.lastname: Sabba
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.
authors.forename: Herlina A
authors.initials: HA
authors.lastname: Dewi
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.|School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore.
authors.forename: Nripan
authors.initials: N
authors.lastname: Mathews
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.
authors.forename: Pablo P
authors.initials: PP
authors.lastname: Boix
authors.affiliation: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore.
authors.forename: Hilmi Volkan
authors.initials: HV
authors.lastname: Demir
authors.affiliation: Energy Research Institute@NTU (ERI@N), Research TechnoPlaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553 Singapore.|School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore.
authors.forename: Subodh
authors.initials: S
authors.lastname: Mhaisalkar