Luminescence of Eu3+ in α-Al2O3 powders

Tanner, Peter A.; Pan, Zaifa; Rakov, Nikifor; Maciel, Glauco S.

doi:10.1016/j.jallcom.2005.12.074

Cited by 22 publications

(10 citation statements)

References 19 publications

(26 reference statements)

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“…Our studies have shown that this replacement does not occur for sol-gel methods and that instead erbium perovskite or garnet phases are formed when Er 3+ is doped into a-Al 2 O 3 at atom percent levels [103]. However, with the use of combustion synthesis [104] it can be demonstrated that some of the Eu 3+ ions occupied a C 3v symmetry site in a-Al 2 O 3 , which is consistent with the replacement of Al 3+ . The 10 K emission spectrum under 471.6 nm excitation, in the region from 570 to 770 nm, is shown in Fig.…”

Section: Luminescence In Non-lanthanide Hostssupporting

confidence: 66%

Lanthanide Luminescence in Solids

Tanner

2010

Lanthanide Luminescence

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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: Luminescence In Non-lanthanide Hostssupporting

confidence: 66%

Lanthanide Luminescence in Solids

Tanner

2010

Lanthanide Luminescence

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“…3(c). 18 Again, the initial luminescent state is 5 D 0 , and the assignments were given in terms of C 3v site symmetry of Eu 3+ , implying that Eu 3+ substitutes at the Al 3+ site.…”

Section: (A)mentioning

confidence: 99%

Some misconceptions concerning the electronic spectra of tri-positive europium and cerium

2013

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Tripositive europium attracts wide interest in diverse fields such as phosphors, sensors, and time-gated bioimaging agents based upon its optical emission spectra. Some inaccurate descriptions of these spectra are being amplified throughout the literature. In this tutorial review the background of electronic states, energy levels and transition intensities is provided as a pre-requisite for clarifying these misconceptions. The topics discussed encompass the electric dipole nature of intraconfigurational 4f electronic transitions, the use of europium as site symmetry and centrosymmetry probe, as well as an indicator of nephelauxetic effects. The frequently mis-used term Stokes shift is also clarified and alternative terms are given for the situations where it is incorrectly applied.

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“…The first case is represented by transitions between energy levels of metal activator ions containing the rare earth and/or transition metal ions (e.g. f-f transitions of Eu 3+ in Y 2 O 3 :Eu 3+ ) [4][5][6][7] or complex ions (e.g. the charge-transfer transition on [WO 4 ] 2À in CaWO 4 ).…”

Section: Introductionmentioning

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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Luminescence of Eu3+ in α-Al2O3 powders

Cited by 22 publications

References 19 publications

Lanthanide Luminescence in Solids

Lanthanide Luminescence in Solids

Some misconceptions concerning the electronic spectra of tri-positive europium and cerium

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

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