Halide perovskite is a promising candidate for high-performance and ultra-compact light emitters which are the core of the next-gen display technology. Despite various µ-Perovskite-LED array design availability, achieving finely controlled emission patterns, by implementing nanopatterns on the active media (metasurfaces), is a key challenge. In this work, we demonstrate a design and fabrication procedure for perovskite metasurface LED whose optical properties are controlled by nanopatterning. The obtained results pave the way for radiation control in perovskite LEDs and micro-LEDs.
In order to obtain a red emission with organic electroluminescent device, we realized multilayer structures using various Europium complexes as emitting layer. The multilayer structures were obtained with the emitting layer deposited on a ITO substrate; a 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) layer was used as hole blocking layer and a tris-(8-hydroxyquinoline) aluminium (Alq3) layer as electron transport layer. Cathode of the devices was realized with a calcium layer covered with an protective aluminium layer.
Two different europium complexes have been tested:
Eu (TTA)3 phen (TTA = thenoyltrifluoroacetone),
Eu (DTP)3 (dipphen) (DTP = 1,3-di(2-thienyl)propane-1,3-dione, dipphen = 4,7-Diphenyl-1,10-phenanthroline)
The Europium complexes were inserted in a poly-9-vinylcarbazole (PVK) matrix and the "spin-coating" process was used to obtain the emitting layers.
The maximum emission of the OLEDs are centered around 610 nm according to the 5D0 → 7F2 transition of the rare earth. Europium complexes absorption spectra in chloroform and electroluminescence spectra are presented. Current-voltage and luminance-voltage characteristics are also presented and we discuss about the results obtained with various molar concentration of Europium complexes in the PVK matrix.
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