Preparation of ZnO thin films for high-resolution field emission display by electron beam evaporation

Nakanishi, Y.; Miyake, Aki; Kominami, Hiroko; Aoki, Toru; Hatanaka, Y.; Shimaoka, Goro

doi:10.1016/s0169-4332(98)00654-0

Cited by 155 publications

(71 citation statements)

References 3 publications

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“…ZnO, a wide band gap semiconductor (3.37 eV), has a range of potential applications as photocatalysts, 1 gas sensors, 2 lasers, 3 displays, 4 high-density optical storage devices 5 and varistors.…”

Section: Introductionmentioning

confidence: 99%

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Microwave-assisted synthesis of ZnO micro-javelins

et al. 2009

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The microwave (MW)-assisted formation of ZnO micro-javelins from zinc nitrate and urea in aqueous solution is described. The particles (named as 'micro-javelins' because of their high aspect ratio and needle-like tips) grow hexagonally with well-defined facets in the h01 10i direction and pointed tips in (0001) direction. Powder X-ray diffraction patterns show the appearance of a strikingly dominant (1000) orientation. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations reveal the morphological evolution of these hexagonal ZnO particles with time. The effect of precursor concentrations, counterion type and MW irradiation power and their consequent influence on pH and Zn 2+ ion concentration are investigated. A mechanism for the formation of the micro-javelins is postulated. The microwave induced supersaturation of Zn(OH) + species under the weakly basic pH condition and the initial growth through the (000 1) direction (oxygen-rich face) are proposed to be the key factors that dictate the formation of these ZnO micro-javelins. The present one-step microwave process is a straightforward and a reproducible method for the bulk synthesis of defect-free ZnO micro-javelins, which would find potential applications in microelectronic devices (e.g. lasers, cantilevers in surface probing equipment, etc.).

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Section: Introductionmentioning

confidence: 99%

“…Firstly the pH of the zinc nitrate-urea mixture was adjusted to 10 using NH 4 OH solution and then irradiated for 18 min. In a second experiment, the reactant mixture was first irradiated for 14 min, allowed to cool down to room temperature, the pH adjusted to 10 with NH 4 OH and then the MW irradiation was carried out for a further 18 min.…”

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confidence: 99%

Microwave-assisted synthesis of ZnO micro-javelins

et al. 2009

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“…[1][2][3] As we know, when the particle sizes of many semiconductors, ZnO included, decrease to nanometer or sub-nanometer scales, these materials usually exhibit quantum size effects, presenting different electric and optical properties from bulk materials. [4][5][6] The study on subnanometric ZnO clusters as a medium between single molecules and nanocrystals is an active area now days, [7][8][9][10][11] but their luminescent properties are rarely reported.…”

Section: Introductionmentioning

confidence: 99%

ZnO Clusters Encapsulated inside Micropores of Zeolites Studied by UV Raman and Laser-Induced Luminescence Spectroscopies

et al. 2004

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Using microporous zeolites as host, sub-nanometric ZnO clusters were prepared in the micropores of the host by the incipient wetness impregnation method. A small amount of sub-nanometric ZnO clusters were introduced into the channels of HZSM-5 zeolite, whereas a large quantity of sub-nanometric ZnO clusters can be accommodated in the supercages of HY zeolite and no macrocrystalline ZnO exists on the extra surface of the HY material. The vibrations of the zeolite framework and ZnO were characterized by UV Raman spectroscopy. The optical properties of these ZnO clusters were studied by UV-visible absorption spectroscopy and laser-induced luminescence spectroscopy. It is found that there are strong host-guest interactions between the framework oxygen atoms of zeolite and ZnO clusters influencing the motions of the framework oxygen atoms. The interaction may be the reason why ZnO clusters are stabilized in the pores of zeolites. Different from bulk ZnO materials, these sub-nanometric ZnO clusters exhibit their absorption onset below 265 nm and show a purple luminescence band (centered at 410-445 nm) that possesses high quantum efficiency and quantum size effect. This purple luminescence band most likely originates from the coordinatively unsaturated Zn sites in sub-nanometric ZnO clusters. On the other hand, the differences in the pore structure between HZSM-5 and HY zeolites cause the absorption edge and the purple luminescence band of ZnO clusters in ZnO/HZSM-5 show a red shift in comparison with those of ZnO clusters in ZnO/HY.

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“…Compared to the powder form, Y 2 O 3 :Eu in thin-film form could offer several advantages, such as better thermal stability, good adhesion to the substrate surface, higher resolution, and uniform properties across the covered area [10]. However, in spite of these potential advantages, relatively little work has so far been carried out on the thinfilm form of Y 2 O 3 :Eu.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Luminescence of Europium-doped Yttrium Oxide Thin Films

Chung

Kim

2017

Appl. Sci. Converg. Technol.

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Thin films of europium-doped yttrium oxide (Y 2 O 3 :Eu) were prepared on Si (100) substrates by using a radio frequency (RF) magnetron sputtering. After the deposition, the films were annealed at 1000 o C in an air ambient for 1 hour. X-ray diffraction analysis revealed that the Y 2 O 3 :Eu films had a polycrystalline cubic α-Y 2 O 3 structure. The as-deposited films showed no photoluminescence (PL), which was due to poor crystalline quality of the films. The crystallinity of the Y 2 O 3 :Eu films was significantly improved by annealing. The strong red PL emission was observed from the annealed Y 2 O 3 :Eu films and the highest intensity peak was centered at around 613 nm. This emission peak originated from theF 2 transition of the trivalent Eu ions occupying the C 2 sites in the cubic α-Y 2 O 3 lattice. The broad PL excitation band was observed at wavelengths below 280 nm, which was attributed to the charge transfer transition of the trivalent Eu ion.

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Preparation of ZnO thin films for high-resolution field emission display by electron beam evaporation

Cited by 155 publications

References 3 publications

Microwave-assisted synthesis of ZnO micro-javelins

Microwave-assisted synthesis of ZnO micro-javelins

ZnO Clusters Encapsulated inside Micropores of Zeolites Studied by UV Raman and Laser-Induced Luminescence Spectroscopies

Preparation and Luminescence of Europium-doped Yttrium Oxide Thin Films

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