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Nano-objets semi-conducteurs III-V écocompatibles

Abstract : During the past few years, organic light-emitting devices (OLEDs) gradually appeared in consumer electronics such as smartphones and television sets. Unfortunately, the OLED market is still curbed by some drawbacks of this technology — namely high manufacturing costs and limited lifetime. By replacing the organic emitting layer by quantum dots, one could expect to partially solve these problems and further improve the performances of the so-called QD-LED devices.The aim of this study is to produce semiconductor nanocrystal quantum dots which are non-toxic and exhibit all the required features for their successful integration inside QD-LED structures.A new approach for the synthesis of colloidal indium antimonide (InSb) nanocrystals relying on the use of a gaseous antimony precursor was firstly developed. Thanks to the optimization of several reaction parameters, the nanocrystals obtained by this pathway exhibit a good crystallinity, a reduced size dispersion, and are highly stable in solution. Unfortunately, no photoluminescence signal was recorded — probably because of an amorphous shell surrounding the particle cores — so these nanocrystals cannot be used for optical applications.Then, we investigated the chemical synthesis of indium phosphide (InP) based quantum dots likely to yield a working QD-LED prototype. Owing to composition gradient shells, we produced nanocrystals exhibiting a high photoluminescence quantum yield and a good stability in oxygen-rich medium.Finally, we made several preliminary attempts in order to integrate indium phosphide based nanocrystals in light-emitting diodes. The quantum dot films were deposited by the “Langmuir-Schaeffer stamping” technique while the other layers made of small molecules were evaporated. Despite its still modest performances, the emission of the elaborated QD-LEDs shows a neat contribution from the embedded quantum dots. These results open the way for future developments.
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https://tel.archives-ouvertes.fr/tel-01367168
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Submitted on : Thursday, September 15, 2016 - 5:00:07 PM
Last modification on : Thursday, June 11, 2020 - 5:04:06 PM
Long-term archiving on: : Friday, December 16, 2016 - 3:09:57 PM

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Axel Maurice. Nano-objets semi-conducteurs III-V écocompatibles. Agrégats Moléculaires et Atomiques [physics.atm-clus]. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENY064⟩. ⟨tel-01367168⟩

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