Blue perovskite light-emitting diodes with suppressed field-induced segregation
Tatiana Liashenko a, Anatoly Pushkarev a, Sergey Makarov a
a ITMO University, St. Petersburg, Russia, 49 Kronverkskii Avenue, St. Petersburg, Russian Federation
Poster, Tatiana Liashenko, 091
Publication date: 25th November 2019

Inorganic lead halide perovskites CsPbX3 (X = Br, Cl or I) have received significant attention due to their astounding optoelectronic properties such as high photoluminescence quantum yield [1], high electron-hole mobility, narrow emission line width [2] and other characteristics. Moreover, their direct band gap [3] can be widely tunable via halide X exchange reaction [4] to cover the entire visible spectrum that allows controlling emission colors of perovskite luminescence. The exceptional properties of halide perovskites make them attractive candidates for various optoelectronic applications such as light-emitting diodes (LEDs), lasers, optical sensors, photodetectors etc. So far, the outstanding performance was achieved for red‐ and green‐emissive PeroLEDs (external quantum efficiencies (EQE) have exceeded 20 %) [5], whereas high efficiency, long-term stability and high material quality of blue electroluminescent (EL) devices still remain challenging. In this work, we report the efficient single-layer blue PeroLEDs based on a composite 3D CsPbBr2Cl:PEO (PEO - poly(ethylene oxide)) thin films and 2D Ruddlesden–Popper perovskites Cs5Pb4Br8Cl5:PEO and Cs4Pb3Br6Cl4:PEO with suppressed segregation and  study their structure, photoluminescence, and electroluminescence.

T.G.L,  A.P.P, and S.V.M acknowledge the Russian Science Foundation (project No. 19-73-30023) for the synthesis of perovskite films and supporting samples characterization.

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