ConPLED · Nanostructured Confined ABX3 Perovskite based Light-Emitting Devices

Nanostructured Confined ABX3 Perovskite based Light-Emitting Devices

The development of low-cost, clean, and scalable energy solutions is imperative to securing a peaceful and sustainable future. Optoelectronic devices such as light-emitting diodes (LEDs) incorporating new, inexpensive materials show tremendous promise to alter the energy landscape by reducing the cost of energy consumption. However, the widespread adoption of LEDs demands new technologies to surpass the luminous efficacies of conventional LED light while having full control over the colour, brightness and directionality of the light source. Recently, a new class of semiconducting materials, ABX3 perovskites, is poised to revolutionise the LED field due to its ease of processing and outstanding electronic and optical properties. In this context, the ultimate goal of this proposal is the development of the first efficient white light LED based on luminescent nanostructured perovskites that feature tuneable on-demand emission properties. In order to achieve these aims, a series of milestones, which are final goals per se, have been pursued: Objective 1. Develop efficient luminescent nanomaterials. We have developed new synthesis routes to fabricate spatially confined ABX3 perovskite with emission spectra covering the entire visible region and compatible with thin-film processing aiming to integrate into LEDs that incorporate nanophotonic structures. Objective 2. Design and develop nanostructured optical materials that shape the emission of halide perovskite films with unprecedented precision in order to attain full control over its colour quality and angular distribution. An optical modelling software package powered by a genetic algorithm has been developed. A hybrid photonic/plasmonic design has been identified as the one with the most promising array of attributes. We have fabricated and combined it with green-emitting perovskites to show the first example of perovskite emission shaped by this type of resonances. Objective 3. Design and fabricate perovskite LEDs governed by quantum regime effects that give rise to an extensive palette of colours. Confinement effects have resulted in LEDs of improved performance with respect to the state-of-the-art when the project started: EQE~20% for green and EQE~1% for blue. A new perovskite based white light LED architecture has been attained.

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