Efficient sky-blue perovskite light-emitting diodes via photoluminescence enhancement.

Abstract:

:The efficiencies of green and red perovskite light-emitting diodes (PeLEDs) have been increased close to their theoretical upper limit, while the efficiency of blue PeLEDs is lagging far behind. Here we report enhancing the efficiency of sky-blue PeLEDs by overcoming a major hurdle of low photoluminescence quantum efficiency in wide-bandgap perovskites. Blending phenylethylammonium chloride into cesium lead halide perovskites yields a mixture of two-dimensional and three-dimensional perovskites, which enhances photoluminescence quantum efficiency from 1.1% to 19.8%. Adding yttrium (III) chloride into the mixture further enhances photoluminescence quantum efficiency to 49.7%. Yttrium is found to incorporate into the three-dimensional perovskite grain, while it is still rich at grain boundaries and surfaces. The yttrium on grain surface increases the bandgap of grain shell, which confines the charge carriers inside grains for efficient radiative recombination. Record efficiencies of 11.0% and 4.8% were obtained in sky-blue and blue PeLEDs, respectively.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang Q,Wang X,Yang Z,Zhou N,Deng Y,Zhao J,Xiao X,Rudd P,Moran A,Yan Y,Huang J

doi

10.1038/s41467-019-13580-w

subject

Has Abstract

pub_date

2019-12-10 00:00:00

pages

5633

issue

1

issn

2041-1723

pii

10.1038/s41467-019-13580-w

journal_volume

10

pub_type

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