Colour tuning of core–shell fluorescent materials

Li, Ling; Tao, Jinhui; Pan, Haihua; Chen, Han-Min; Wu, Xiaowei; Zhu, Feijian; Xu, Xurong; Tang, Ruikang

doi:10.1039/b811552d

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…One such method to produce white light uses downconversion in core-shell materials. This was achieved by employing Y 2 O 3 : Eu 3+ core-LnPO 4 (Ln ¼ Ce, Tb) shell micron-size particles [153]; by the use of nanoparticles comprising LaF 3 doped with Eu 3+ as core; with Tb 3+ as first shell; with Tm 3+ as second shell; and then with LaF 3 passive coating [154]; or by coreshell CaWO 4 microspheres co-doped with Na + and Ln 3+ (Ln ¼ Tb, Sm, Dy, Eu) [155]. The use of several lanthanide ions for white light generation can be avoided if use is made of CT emission in conjunction with the emission of one lanthanide ion.…”

Section: White Lightmentioning

confidence: 99%

Lanthanide Luminescence in Solids

Tanner

2010

Springer Series on Fluorescence

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A tutorial introduction to the spectra of lanthanide ions is given. The chapter begins with a brief comparison of luminescence of lanthanide ions (Ln 3+ ) in the solid, liquid, and gas phases. Then a description of the importance of nonradiative versus radiative processes is made. The various types of transition of lanthanide ions encountered are then introduced: 4f N -4f N ; 4f N -4f NÀ1 5d; charge transfer; host band-to-band; and defect site or impurity transitions. Reference is briefly made to the spectra of dipositive ions. The luminescence of lanthanide ions in non-lanthanide hosts is examined, and the importance of locating the relative positions of Ln 3+ energy levels relative to the host band gap is stressed. Some of the various upconversion phenomena, including second harmonic generation, twophoton absorption, ground state/excited state absorption, energy transfer upconversion, and photon avalanche, are then described with reference to Ln 3+ and Ln 3+ -TM n+ (transition metal) systems. The experimental distinctions of which particular process is operative in a given system are explained by considering the power, concentration, and lifetime dependences, and the upconversion excitation spectrum. Some applications of lanthanide luminescence are briefly reviewed and a mention of the luminescence in nanomaterials is also included.

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Section: White Lightmentioning

confidence: 99%

Lanthanide Luminescence in Solids

Tanner

2010

Springer Series on Fluorescence

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“…Ceria shows weak emission characteristics which limits its application as light emitting phosphor and its identification in biological and cellular studies. It has been observed that the luminescence properties of weakly emitting particles can be improved by doping of the parent matrix with elements which can emit by itself upon excitation in the UV-visible range of the spectrum [20]. The comparable ionic radius of cerium ions and europium ions favors the latter's extensive solubility in the ceria matrix.…”

Section: Introductionmentioning

confidence: 99%

White light emission from sonochemically synthesized rare earth doped ceria nanophosphors

Dutta

Manoj

Tyagi

2011

Journal of Luminescence

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“…It also makes the material more bulky and thus limits the penetration of the cells by the nanoparticles. A secondary approach that involves doping of the parent matrix with elements that can emit by itself upon excitation in the UV−visible range of the spectrum presents a better alternative.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Properties of Europium-Doped Cerium Oxide Nanoparticles: Role of Vacancy and Oxidation States

et al. 2009

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Enhancing the optical emission of cerium oxide nanoparticles is essential for potential biomedical applications. In the present work, we report a simple chemical precipitation technique to synthesize europium-doped cerium oxide nanostructures to enhance the emission properties. Structural and optical properties showed an acute dependence on the concentration of oxygen ion vacancy and trivalent cerium, which, in turn, could be modified by dopant concentration and the annealing temperature. Results from X-ray photoelectron spectroscopy showed an increase in tetravalent cerium concentration to 85% on annealing at 900 degrees C. The concentration of oxygen ion vacancy increased from 1.7x10(20) cm(-3) to 4.1x10(20) cm(-3) with the increase in dopant concentration. Maximum emission at room temperature was obtained for 15 mol % Eu-doped ceria, which improved with annealing temperature. The role of oxygen ion vacancies and trivalent cerium in modifying the emission properties is discussed.

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Colour tuning of core–shell fluorescent materials

Cited by 11 publications

References 24 publications

Lanthanide Luminescence in Solids

Lanthanide Luminescence in Solids

White light emission from sonochemically synthesized rare earth doped ceria nanophosphors

Luminescence Properties of Europium-Doped Cerium Oxide Nanoparticles: Role of Vacancy and Oxidation States

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