Visible photoluminescence from SiOx films grown by low temperature plasma enhanced chemical vapor deposition

Timofeev, F.N.; Aydınlı, Atilla; Ellialtioglu, R.; Turkoglu, K.; Gure, M.; Mikhailov, V. N.; Lavrova, O. A.

doi:10.1016/0038-1098(95)00299-5

Cited by 19 publications

(8 citation statements)

References 13 publications

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“…Previously, off-stoichiometric silicon oxide (SiO x , x o 2) thin films can often be synthesized via chemical vapor deposition. 141,142 In addition, Becher's group reported the fluorescence and polarization spectroscopy of single silicon vacancy centers in heteroepitaxial nanodiamonds on iridium using microwave plasma chemical vapor deposition. 143 Yang and co-workers have successfully fabricated the In 2 O 3 -ZnO one-dimensional nanosized heterostructures constructed by In 2 O 3 quadrangular columns and ZnO hexagonal disks by thermal chemical vapor transport.…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

Defect-related luminescent materials: synthesis, emission properties and applications

2012

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Luminescent materials have found a wide variety of applications, including information displays, lighting, X-ray intensification and scintillation, and so on. Therefore, much effort has been devoted to exploring novel luminescent materials so far. In the past decade, defect-related luminescent materials have inspired intensive research efforts in their own right. This kind of luminescent material can be basically classified into silica-based materials, phosphate systems, metal oxides, BCNO phosphors, and carbon-based materials. These materials combine several favourable attributes of traditional commercially available phosphors, which are stable, efficient, and less toxic, being free of the burdens of intrinsic toxicity or elemental scarcity and the need for stringent, intricate, tedious, costly, or inefficient preparation steps. Defect-related luminescent materials can be produced inexpensively and on a large scale by many approaches, such as sol-gel process, hydro(solvo)thermal reaction, hydrolysis methods, and electrochemical methods. This review article highlights the recent advances in the chemical synthesis and luminescent properties of the defect-related materials, together with their control and tuning, and emission mechanisms (solid state physics). We also speculate on their future and discuss potential developments for their applications in lighting and biomedical fields.

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Section: Chemical Vapor Depositionmentioning

confidence: 99%

Defect-related luminescent materials: synthesis, emission properties and applications

2012

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“…They can be prepared by sputtering in water vapor 8 or by plasma enhanced chemical vapor deposition using a gas mixture of N 2 O and SiH 4 . 9,10 The purpose of this letter is to show that the evaporation technique also permits to obtain a-SiO x thin films which present a very intense PL visible to the naked eye. In order to understand the influence of hydrogen in these materials, hydrogenated alloys were also prepared with the same elaboration technique.…”

Section: ͓S0003-6951͑98͒00124-7͔mentioning

confidence: 99%

Intense visible photoluminescence in amorphous SiOx and SiOx:H films prepared by evaporation

Rinnert¹,

Vergnat²,

Marchal³

et al. 1998

Applied Physics Letters

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Visible photoluminescence (PL) can be observed in a-SiOx and a-SiOx:H alloys prepared by evaporation of SiO in ultrahigh vacuum and under a flow of hydrogen ions, respectively. The hydrogen and oxygen bonding is studied by infrared spectrometry. The hydrogen stability is followed by thermal desorption spectrometry experiments. The evolution of the PL with annealing treatments shows that the PL can be attributed to a quantum confinement effect in a-Si clusters embedded in the matrix of a-SiOx. Hydrogen does not greatly contribute to the PL efficiency and to the thermal evolution of the a-Si clusters.

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“…The SiO x film is then annealed at high temperature (>900 °C), which causes phase separation between Si and SiO 2 with the formation of small Si nanocrystals 250. 275 Sub‐stoichiometric SiO 2 thin films are usually formed on substrates by plasma‐enhanced CVD (PECVD)276–284 or PVD,284–288 such as radiofrequency magnetron sputtering and plasma‐assisted sputtering. In the PECVD procedure, a combination of SiH 4 with N 2 O276–280 or SiH 4 with O 2 280–282 are usually used as source gases.…”

Section: Nanostructured Silicon In or On Bulk Substratesmentioning

confidence: 99%

Highly Enantioselective Synthesis of β‐Amino Acid Derivatives by the Lewis Base Catalyzed Hydrosilylation of β‐Enamino Esters

Zheng

Chen

et al. 2008

Chemistry A European J

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Optically active b-amino acids are very important chiral building blocks for the synthesis of b-peptides, b-lactams, natural products, and physiologically active substances. [1] Therefore, efficient methods for the synthesis of optically active b-amino acids would be of great value for drug discovery and organic synthesis. Among the approaches to chiral b-amino acids, [2] the most straightforward and atom economic one is catalytic asymmetric reduction of b-enamino esters. Pioneered by Noyori et al., [3a] many chiral transition-metal complexes were developed to catalyze high-pressure hydrogenation of N-acyl b-enamino esters, [3] N-aryl benamino esters, [4] or N-unprotected b-enamino esters [5] with high enantioselectivities. However, transition-metal-catalyzed hydrogenation cannot get rid of the problems of metal leaching, high pressure, the cost of the catalyst, and its regeneration.Recently, asymmetric reactions involving the strategy of Lewis base activation of Lewis acids attracted much attention.[6] Among these reactions, Lewis base catalyzed enantioselective hydrosilylation of ketimines has become an important alternative to transition-metal catalysis in synthesis of chiral amines.[7] However, there is only limited examples of enantioselective hydrosilylation of b-enamino esters. [7b, 8] To our knowledge, a general, highly enantioselective Lewis base organocatalyzed hydrosilylation of b-enamino esters has not been reported, and thus remains an important challenge.Herein, we describe the first general, highly enantioselective organocatalytic hydrosilylation of b-enamino esters. Matsumura and co-workers reported the hydrosilylation of unprotected b-enamino ester 1 a catalyzed by N-picolinoylpyrrolidine derivative 2 a that resulted in poor yield and enantioselectivity (Scheme 1).[7b] However, to our delight, we found that the same catalyst 2 a and its analogues displayed excellent activities and enantioselectivities in promoting hydrosilylation of N-aryl b-enamino esters.First, N-picolinoylpyrrolidine derivatives 2 a-2 e and N-picolinoylephedrine (4) [7m] were evaluated in hydrosilylation of (Z)-methyl 3-phenyl-3-(phenylamino)acrylate.[9] As can be seen in

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Visible photoluminescence from SiOx films grown by low temperature plasma enhanced chemical vapor deposition

Cited by 19 publications

References 13 publications

Defect-related luminescent materials: synthesis, emission properties and applications

Defect-related luminescent materials: synthesis, emission properties and applications

Intense visible photoluminescence in amorphous SiOx and SiOx:H films prepared by evaporation

Highly Enantioselective Synthesis of β‐Amino Acid Derivatives by the Lewis Base Catalyzed Hydrosilylation of β‐Enamino Esters

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