Erbium photoluminescence response related to nanoscale heterogeneities in sol-gel silicates

Vasconcelos, Helena Cristina; Meirelles, Maria; Rivera-López, F.

doi:10.1016/s1002-0721(12)60228-2

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…These mechanisms decrease fluorescence efficiency [34]. Moreover, it was shown that RE-host interactions result from defects (porosity and/or passive crystallites dispersed in matrix), expressed by an intensity decrease in the fluorescence emission; symmetry factors that arise from host nature (amorphous or crystalline), expressed by the character of the lifetime decay curve, and cross-relaxation, expressed by the broadening/narrowing (shape) of a specific transition [15]. All of these processes depend on the type and composition of the glass used.…”

Section: Basic Principles Of Fluorescence: Specificities Of Sol-gel Gmentioning

confidence: 99%

“…Annealing the doped gels changes the local environment of the RE ions, which results in changes in the fluorescence emission shape [15].…”

Section: Basic Principles Of Fluorescence: Specificities Of Sol-gel Gmentioning

confidence: 99%

“…Special actions are needed to suppress RE clustering. A promising approach is to add suitable network modifiers to SiO 2 , such as Al 2 O 3 and P 2 O 5 , in order to improve the RE solubility [15,16]. The performances of the amplifier are governed by the electronic and optical characteristics of the RE ion but are also strongly influenced by matrix properties.…”

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confidence: 99%

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Fluorescence Properties of Rare-Earth-Doped Sol-Gel Glasses

Vasconcelos¹,

Pinto²

2017

Recent Applications in Sol-Gel Synthesis

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Glasses may be prepared by sol-gel processing over a wide range of compositions and thick multilayer deposits may be used as waveguides for integrated optics. Doping these layers with rare-earth (RE) ions enables the fabrication of active devices for optical amplifiers; the incorporation of these ions into nanocrystallites offers possibilities for increased dopant concentration without fluorescence quenching, improved spectroscopic performance and high quantum yields. Rare-earth (RE) ions such as erbium (Er 3+ ), ytterbium (Yb 3+ ), neodymium (Nd 3+ ), thulium (Tm 3+ ), holmium (Ho 3+ ) and praseodymium (Pr 3+ ) have been widely used in optical applications and cover a range of wavelengths ranging from UV-visible to the near infrared. This chapter includes basic principles of fluorescence in RE doped glasses, fluorescence lifetimes, quantum yields and Judd-Ofelt analysis. A few information is given about the preparation and characterization of glasses, thin films and glass-ceramics (nanocrystallites embedded in glass matrix) prepared by sol-gel processing. The growth of nanocrystals in glassy sol-gel films through suitable heat treatments can avoid the influence of high phonon energy of silica glasses. The characterization of such materials can be evaluated by optical techniques, namely UV-Visible, FTIR, among other additional techniques that include Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Atomic Force Microscopy (AFM).The need for high-speed data associated with the advance of telecommunication systems by optical transmission and fiber-optic connections has contributed to extend the optical regime

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Section: Basic Principles Of Fluorescence: Specificities Of Sol-gel Gmentioning

confidence: 99%

“…Annealing the doped gels changes the local environment of the RE ions, which results in changes in the fluorescence emission shape [15].…”

Section: Basic Principles Of Fluorescence: Specificities Of Sol-gel Gmentioning

confidence: 99%