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Blue-emission tuning of perovskite light-emitting diodes with a simple TPBi surface treatment

Huang, Xiaokun; Bäuerle, Rainer; Tisserant, Jean-Nicolas; Kowalsky, Wolfgang; Lovrinčić, Robert; Hernandez-Sosa, Gerardo

Abstract:
We demonstrate a simple approach for blue-emission tuning of quasi-2D perovskite light-emitting diodes through a surface treatment of 2,2′,2″-(1,3,5-benzinetriyl)tris(1-phenyl-1H-benzimidazole) (TPBi). By increasing the TPBi concentration, we achieved tunable electroluminescence of the perovskite layer with wavelength shifted from the blue-green (506 nm) to blue (481 nm) regions of the visible spectrum. Fourier-transform infrared spectroscopy, scanning electron microscopy, and UV–Vis absorption spectroscopy were conducted to study the morphological and optoelectronic properties of the films. Our results suggest that the TPBi molecules accumulated on the surface and grain boundaries of the perovskite layer changed the perovskite electronic structure causing the observed blue shifts.


Verlagsausgabe §
DOI: 10.5445/IR/1000140245
Veröffentlicht am 23.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2159-6859, 2159-6867
KITopen-ID: 1000140245
HGF-Programm 38.01.02 (POF IV, LK 01) Materials and Interfaces
Erschienen in MRS communications
Verlag Cambridge University Press (CUP)
Vorab online veröffentlicht am 26.10.2021
Nachgewiesen in Web of Science
Scopus
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