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The new class of hybrid organic-inorganic semiconductor (HOIS) materials,based on halide perovskites, is constantly being pursued for applications suchas Light Emitting Diodes (LEDs) and solar cells, due to their momentousoptoelectronic properties. In this work, we present a single layer LED thatoperates due to energy transfer effects as well as a simple, instant and lowcost method for its fabrication. A LED device based on a mixture of zerodimensional (OD) (CH 3 NH 3 ) 4 PbI 6, two dimensional (2D) (F- C 6 H 4 CH 2 CH2 NH 2 ) 2 PbI 4 and three dimensional (3D) (CH 3 NH 3 )PbI 3 HOIS, ispresented for the first time. The final composite material manifests simple,yet unique energy transfer optical effects, while its electroluminescenceexhibits excitonic recombination bright yellow light, peaked at 592 nm. LEDdevice fabricated under ambient air, readily functions at room temperature andlow voltages. As for the active layer, it exhibited substantial film continuityin any form of deposition. Finally, with appropriate mixtures, it is possibleto create films containing phase changes that exhibit dual color emission, herepresented as yellow-green.

Yellow Light Energy Transfer Emitting Diodes Based on mixed Quasi-2D Perovskites