Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
105 0 |
SM ISO690:2012 LUPAN, Oleg, VIANA, Bruno, PAUPORTE, Thierry, DHAOUADI, Maroua, PELLÉ, Fabienne, DEVYS, Lucie, GACOIN, Thierry. Controlled mixed violet-blue-red electroluminescence from Eu:Nano-phosphors/ZnO-Nanowires/p-GaN light-emitting diodes. In: Journal of Physical Chemistry C, 2013, vol. 117, pp. 26768-26775. ISSN 1932-7447. DOI: https://doi.org/10.1021/jp407783c |
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Journal of Physical Chemistry C | |
Volumul 117 / 2013 / ISSN 1932-7447 /ISSNe 1932-7455 | |
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DOI:https://doi.org/10.1021/jp407783c | |
Pag. 26768-26775 | |
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Europium (Eu):Y2O3-nanoparticles/Mg:ZnO-nanowires/p- GaN and (Eu):chelate-based light-emitting diode (LED) structures have been fabricated, showing controlled mixed near-UV, violet, and red electroluminescence from trivalent europium. The magnesium (Mg)-doped ZnO (Mg:ZnO)-nanowires/p-GaN heterojunction were integrated into the LED structure and were covered on the top with the nanoparticle of yttrium oxide doped with trivalent europium ions (Eu3+:Y2O3) or by Eu:chelate. Samples exhibit mixed UV/blue light at ∼384 nm coming from the Mg:ZnO structure and a sharp red emission at ∼611 nm related to the intra4f transition of Eu ions. It is found that with Mg doping of ZnO, the emission wavelength of LEDs in the near-ultraviolet region is shifted to a smaller wavelength, thus being better adapted to the trivalent europium excitation band. Radiative energy transfer is achieved through the strong overlap between the emission wavelength from n-(Mg:ZnO)/p-GaN heterojunction and 7F 0-5L6 absorption of Eu3+ ions in the case of Eu:Y2O3 or of the (Eu):chelate intensive absorption bands. Indeed, the (Eu):chelate/(Mg:ZnO)-nanowires/p-GaN structure appears to be more adapted to UV/blue and red dual emission than Eu:Y 2O3, for which low absorption prevents efficient emission. Our results demonstrate that the designs of nano-LED structures and of the chelate ligands are crucial to enhance the performance of electroluminescence devices based on ZnO nanowire arrays and rare-earth metal complexes |
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Cuvinte-cheie Engineering controlled terms Chelation, Electroluminescence, Europium, Gallium nitride, Heterojunctions, Ions, metal complexes, nanowires, Zinc oxide Engineering uncontrolled terms Electroluminescence devices, Emission wavelength, Near-ultraviolet regions, Radiative energy transfer, Red electroluminescence, Trivalent europium, Trivalent europium ions, ZnO nanowire arrays Engineering main heading Light emitting diodes |
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