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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Apostoluk, Aleksandra
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Topics
Publications (15/15 displayed)
- 2021Metallic oxide defect luminescent emission for application in solar cells and WLEDs
- 2017Sol-gel processing of hybrid ZnO quantum dots mesospheres for LED applications
- 2016Zinc oxide nanocomposites for solar energy conversion and LED applications
- 2016Intense visible emission from ZnO/PAAX (X = H or Na) nanocomposite synthesized via a simple and scalable sol-gel methodcitations
- 2009Growth of thin polymer films containing side-chain azo-dye analyzed by atomic force microscopycitations
- 2007Dual-frequency coherent induction of non-centrosymmetry in a chiral bisazo-dye doped polymer filmcitations
- 2007Influence of molecular chain orientation on optical and carrier transport properties of polymer blends
- 2007Effect of the molecular chain orientation on carrier transport and optical properties of polymer blends
- 2007Influence of polar molecular chain orientation on optical and carrier transport properties of polymer blendscitations
- 2006Effect of molecular chain orientation on carrier transport and optical properties of polymer blends
- 2006Optical and carrier transport properties of polymer blends as influenced by polar molecular chain orientation
- 2004Photoinduction of surface-relief gratings during all-optical poling of polymer filmscitations
- 2004Semiconducting dye-functionalised poled polymers for photovoltaic applications
- 2003Quasi phase matched chi(2) gratings printed with various memory mechanisms by dual frequency interferences in polymer films
- 2002Quasi-phase-matched gratings printed by all-optical poling in polymer filmscitations
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document
Sol-gel processing of hybrid ZnO quantum dots mesospheres for LED applications
Abstract
An important economic improvement of white light emitting diode is based on the use of lanthanidefree phosphors that are supposed to convert UV light into visible one, thanks to downconversion (DS) process. ZnO nanoparticles (NPs) have aroused an increasing interest since they possess a variety of intrinsic defects that provide light emission in the visible range without the introduction of any additional impurity . However , high photoluminescent quantum yield (PLQY), green/yellow emission, stable dispersion and easy scale–up process are expected for industrial applications. Lidoping and polymer surface modifications of ZnO nanoparticles are mainly used in order to reach high PLQY (>30%) but PLQY decay over few days, uses of sophisticated polymers or multistep reactions are the main issues for industrial implementation. Recently , we developed and patented an industrycapable (in terms of legislation concerns) and cost effective chemical solution process to get unique mesospheric selfassembly hybrid ZnO system with intense (PLQY = 4075%) and stable visible emission. This hierarchical structure revealed to be efficient scatterer , resulting in a significant increase of the lightharvesting capability . W e also demonstrate that the use of mixture of commercial polyacrylic acidbased polymers can provide scalable amounts of ZnO NPs clear water suspensions that can be dried and dispersed again in water without compromising the functional performance (e.g. transparency and PLQY) of the final DS layer. Herein, we will address the effects of the ZnO NPs surface functionalization such as nature, molecular weight, concentration, ratio of the P AAbased polymers and selfassembly process but also the impacts of transition metal dopings (nature and content) on the enhancement of the efficiency and on the control of the emission colour light of DS thin films in LED technology . Some examples of LED prototypes will also be presented.