Strong Luminescence and Easy Color Control for SiOx Thin Films by Using RF Magnetron Sputtering

Joo, Jiho; Jang, Seunghun; Jung, Ki-Young; Ko, Changhun; Han, Mei

doi:10.3938/jkps.53.1685

Cited by 1 publication

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“…The charge transfer mechanism between O and Si occurs only in the blue region [26] and therefore also cannot account for the new peaks. Even emission from nanocrystalline silicon [27] has been considered, but since the XPS in our previous work [14] does not show a peak related to pure Si this is ruled out. What remains is emission due to defects, suggesting that the presence of Ag creates new optically active defects in the SiO 2 network which may be responsible for these new peaks.…”

Section: Methodsmentioning

confidence: 95%

“…What remains is emission due to defects, suggesting that the presence of Ag creates new optically active defects in the SiO 2 network which may be responsible for these new peaks. PL emission close to 380 nm has been attributed to surface defects formed after exposure to an abundant oxygen environment [27]. In our case, the silver ions (in Ag 2 O) convert to metallic Ag (in the form of NPs) at high temperature and during this process oxygen is released, suggesting an abundant oxygen environment suitable for the formation of these defects.…”

Section: Methodsmentioning

confidence: 96%

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White luminescence from sol–gel silica doped with silver

Abbass

Swart

Kroon

2015

J Sol-Gel Sci Technol

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Undoped silica and Ag-doped silica (SiO 2 ) were synthesized by the sol-gel method. The photoluminescence properties as a function of annealing temperature were investigated in detail. The addition of Ag introduced new optical active centres in the sample annealed at 1000°C, responsible for emission bands at 2.25 eV (550 nm) and 3.26 eV (380 nm) in the SiO 2 luminescence spectrum. These new emission bands were related to excess oxygen due to decomposition of Ag 2 O at high temperatures. The additional luminescence band at 2.25 eV changed the blue emission from pure SiO 2 to near white light from Ag-doped SiO 2 , suggesting that the SiO 2 :Ag system may be suitable for solidstate lighting applications. The stability of this phosphor under ultraviolet irradiation was investigated. Graphical Abstract

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Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 96%