Journal
ACS NANO
Volume 12, Issue 4, Pages 3417-3423Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b09148
Keywords
perovskite light-emitting diode; nanosized single crystal; amine ligand; defect site; electroluminescence blinking
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Funding
- Mid-Career Researcher Program [2015R1A2A2A01003263, 2018R1A2B2006198]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20163010012450]
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20163010012450]
- Engineering and Physical Sciences Research Council (UK)
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Organic inorganic hybrid perovskites are emerging as promising emitting materials due to their narrow full-width at half maximum emissions, color tunability, and high photoluminescence quantum yields (PLQYs). However, the thermal generation of free charges at room temperature results in a low radiative recombination rate and an excitation-intensity-dependent PLQY, which is associated with the trap density. Here, we report perovskite films composed of uniform nanosized single crystals (average diameter = 31.7 nm) produced by introducing bulky amine ligands and performing the growth at a lower temperature. By effectively controlling the crystal growth, we maximized the radiative bimolecular recombination yield by reducing the trap density and spatially confining the charges. Finally, highly bright and efficient green emissive perovskite light emitting diodes that do not suffer from electroluminescence blinking were achieved with a luminance of up to 55 400 cd m(-2), current efficiency of 55.2 cd A(-1), and external quantum efficiency of 12.1%.
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