A Study of the Device Performance and Light Characteristics Stability of Quantum Dot Based White Light Emitting Diodes
Bruno Clasen Hames a, Rafael Sánchez a, Iván Mora-Seró a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SE1: Fundamental Processes in Semiconductor Nanocrystals
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Arjan Houtepen and Zeger Hens
Poster, Bruno Clasen Hames, 183
Publication date: 20th June 2016

The advances of the image quality achieved in the last decades have entailed the need of developing new technologies for producing displays with remarkably more exigent standards. Nowadays, the display market is mainly governed by the LCD-LED technology; however, it suffers from limitations that can be overcome with the development of the next generation of electroluminescent displays. The introduction of colloidal quantum dots as down-converters has enabled producing displays with extremely high color purity and gamut. Therefore, colloidal nanocrystals are excellent candidates for the preparation of electroluminescent devices, which constitutes a straightforward approach for the development of unprecedented high quality displays. We have synthesized light emitting quantum dots covering the whole visible spectrum with high fluorescence quantum yields and color purity, and produced highly bright multicolored LEDs with external quantum efficiencies of 0.39, 1.04, 2.10 and 1.30 % for Red, Orange, Green and Blue emitting dots, respectively. Additionally, white LEDs were prepared by mixing QDs, which showed color temperatures of 5300 K and color rendering indexes beyond 80 %. Very importantly, we have exhaustively characterized the LED performances, thus providing crucial information towards the development of high quality electroluminescent displays, such as response time, stability and evolution of light characteristics.

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