Photon Reabsorption in Mixed CsPbCl3:CsPbI3 Perovskite Nanocrystal Films for Light-Emitting Diodes

Nathaniel J. L. K. Davis, Francisco J. de la Peña, Maxim Tabachnyk, Johannes M. Richter, Robin D. Lamboll, Edward P. Booker, Florencia Wisnivesky Rocca Rivarola, James T. Griffiths, Caterina Ducati, S. Matthew Menke, Felix Deschler, Neil C. Greenham

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Cesium lead halide nanocrystals, CsPbX3 (X = Cl, Br, I), exhibit photoluminescence quantum efficiencies approaching 100% without the core–shell structures usually used in conventional semiconductor nanocrystals. These high photoluminescence efficiencies make these crystals ideal candidates for light-emitting diodes (LEDs). However, because of the large surface area to volume ratio, halogen exchange between perovskite nanocrystals of different compositions occurs rapidly, which is one of the limiting factors for white-light applications requiring a mixture of different crystal compositions to achieve a broad emission spectrum. Here, we use mixtures of chloride and iodide CsPbX3 (X = Cl, I) perovskite nanocrystals where anion exchange is significantly reduced. We investigate samples containing mixtures of perovskite nanocrystals with different compositions and study the resulting optical and electrical interactions. We report excitation transfer from CsPbCl3 to CsPbI3 in solution and within a poly(methyl methacrylate) matrix via photon reabsorption, which also occurs in electrically excited crystals in bulk heterojunction LEDs.
Original languageEnglish (US)
Pages (from-to)3790-3796
Number of pages7
JournalThe Journal of Physical Chemistry C
Volume121
Issue number7
DOIs
StatePublished - Feb 9 2017
Externally publishedYes

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