The induced electric dipole transitions are parametrized by the juddofelt theory. The luminescence quantum yields were calculated by means of the juddofelt theory and the highest value 60. Principles and practices find, read and cite all the research you need on researchgate. Bach thanh cong, hanoi university of science, vietnam national university, hanoi, vietnam. Linbo3 crystals with various concentration of ho2o3 were grown by czochralski technique. Calculation of the matrix element of the radiation operator. An explanation of hypersensitive transition hst through. Application of standard and modified juddofelt theories.
These measurements are applied in the judd ofelt theory to determine radiative transition rates of spontaneous emission. Judd ofelt utility theory is that it provides a theoretical way of determining the spectral line intensity of a transition 5, 6. Luminescence spectroscopy is studied under cw diode laser excitation at 785nm. Juddofelt theory and thermometry of europium doped materials abstract. Dec 29, 2017 bayesian inference was used as a new approach to calculate of rare earth re ion spectroscopic parameters within the judd. Ofelt intensity parameters and spectral properties of. These measurements are applied in the juddofelt theory to determine radiative transition rates of spontaneous emission. Juddofelt theory the jo theory describes the optical intensities of the 4f4f transitions of rare earth elements. Application of standard and modified juddofelt theories to a.
Drami tanin vin ca institute of nuclear sciences, university of belgrade, p. The semiempirical approach of the juddofelt theory that defines the oneparticle parametrization scheme is modified here. Optical properties and juddofelt intensity parameters of. Bayesian inference was used as a new approach to calculate of rare earth re ion spectroscopic parameters within the judd. The theory was introduced independently in 1962 by brian r. It is suggested that the present theory predicts the correct order of linetoline intensities for the laser transitions emanating from.
Juddofelt jo theory to describe the intensity of ff transitions in rareearth ions27,28 has become a centerpiece of rareearth spectroscopy. Based on the juddofelt theory, the intensity parameters were. The calculated energy levels and the judd ofelt intensity parameters compare reasonably well with available experimental data. Lanthanidedoped klu 2 f 7 nanoparticles with high upconversion luminescence performance. Pdf applications of juddofelt theory to praseodymium. Ofelt theory the golden and the only one theoretical tool of f.
Radiative lifetime electric dipole transition ofelt theory electric dipole matrix element single configuration approximation. Efficient green luminescence of terbium oxalate crystals. A method which takes into account normalized oscillator strengths is detailed for the calculation of parameters in juddofelt theory b. The remarkable success of this theory provides a sobering testament to simple approximations. Practices the juddofelt theory, in practice, is used to determine a set of phenomenological parameters. Application of juddofelt theory upon chlofluorophosphate. The chapter discusses the advantages and limitations of the judd. The original juddofelt theory is briefly presented in the terms of effective operators defined in the traditional form that has been used for many years for the interpretation of the f spectra of rare earths. The juddofelt theory, 14 describes intensities of transitions of lanthanides and actinides in solids and solutions, whereas juddofelt parameters characterize local structure and bonding in the vicinity of rare earth ions.
The intensity of induced electric dipole transitions can be described in terms of three phenomenological intensity parameters d2, 4 and 6. An extension of the juddofelt theory to the field of. The judd ofelt j o theory has had a remarkable success in the characterization of radiative transitions in lanthanide doped solids. Recently, the mathcad 14 program have been employed to find. Judd ofelt theory judd ofelt theory briefly describes the transition intensities for lanthanides and actinides in solids and solutions. The effect of dopant ion concentration and excitation power on the observed luminescence are considered in these.
Schweizer 2,3 centre for innovation competence silinano, martin luther university of hallewittenberg, karlfreiherrvonfritschstra. An explanation of hypersensitive transition hst through juddofelt covalency and symmetry parameters. The juddofelt theory is an effective tool for exploring the optical transition properties for the 4f4f transitions of lanthanides. This system was synthesized by the fusion method, and the physical properties of the assynthesized material were investigated. Optical absorption and juddofelt analysis juddofelt jo theory to describe the intensity of ff transitions in rareearth ions 27,28 has become a centerpiece of rareearth spectroscopy and nowadays it is being considered a fundamental stage in the characterization of luminescent materials. The main topic of this research is an extension of the juddofelt theory, a theoretical model applied to the luminescence thermometry, aimed to evaluate the thermometric figures of merit through juddofelt intensity parameters. This theory provides information about oscillator strengths, radiative lifetime, and emission probabilities. The judd ofelt theory, 14 describes intensities of transitions of lanthanides and actinides in solids and solutions, whereas judd ofelt parameters characterize local structure and bonding in the vicinity of rare earth ions. Nov 23, 2009 the original judd ofelt theory is briefly presented in the terms of effective operators defined in the traditional form that has been used for many years for the interpretation of the f spectra of rare earths. Ofelt parameters via bayesian inference springerlink. O theory as a tool used widely for the theoretical description of the spectroscopic properties of the lanthanide materials. The semiempirical approach of the judd ofelt theory that defines the oneparticle parametrization scheme is modified here. This article is within the scope of wikiproject chemistry, a collaborative effort to improve the coverage of chemistry on wikipedia.
When juddofelt intensity parameters of polynuclear compounds with asymmetric centers are calculated using the current procedure, the results are inconsistent. Juddofelt theory is a theory in physical chemistry describing the intensity of electron transitions within the 4f shell of rareearth ions in solids and solutions the theory was introduced independently in 1962 by brian r. Yag transparent laser ceramic li jiang 1, yang zhiyong 1, wu yusong 1,2, liu wenbin 1, pan yubai 1, huang liping 1, guo jingkun 1. National aeronautics and international school of atomic and molecular spectroscopy space administration erice, italy june 2005. Spectroscopic properties and juddofelt theory analysis of nd. Are the juddofelt intensity parameters sensitive enough.
If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. Juddofelt parameters, radiative and nonradiative transition rates and emission quantum e. The optical performance of these doped glasses suggesting the relevance of these glasses for optical fiber wave guide lasers and optical amplifiers. The radiative properties of active ions have been evaluated by applying juddofelt theory on the measured absorption spectrum. Luminescence studies and juddofelt analysis on sio 2. Together, judds and ofelts 1962 papers became known as the judd ofelt theory, a term that was first coined by weber in 1967. Principles and practices find, read and cite all the research you need on. Influence of overlapping transitions and sensitized transitions are discussed, as well as the use of the standard or normalized method.
Ofelt theory using the li 2 ob 2 o 3al 2 o 3 glass system doped with nd 2 o 3 and tio 2. Relic stands for rare earth level and intensity calculations. Structural properties, juddofelt calculations, and near. A case study with judd ofelt theory and single crystal structure analysis and the effect of dehydration on luminescence. The theory however was already being applied in the mid1960s by axe and krupke et al.
The accuracy of the juddofelt theory is investigated in several rare earth doped glasses. The relic software package allows the user to calculate intermediatecoupling wavefunctions, energy levels, transition strengths juddofelt theory, and radiative decay properties of tripositive lanthanide ions in solids. Using a normalized method to fit the experimental data, we show that an average accuracy of 5 to 15% is. The juddofelt theory 1,2 is widely used to calculate 4f transition intensi ties of rare earth ions in various hosts 3. The calculated energy levels and the juddofelt intensity parameters compare reasonably well with available experimental data. An extension of the juddofelt theory, a theoretical model to the field of luminescence intensity ratio method in phosphor thermometry has been presented, that enables a calculation of thermometric figures of merit. The accuracy of the judd ofelt theory is investigated in several rare earth doped glasses. A comparative study by juddofelt analysis and energy transfer mechanistic. This article is within the scope of wikiproject physics, a collaborative effort to improve the coverage of physics on wikipedia.
Theoretical methodologies for calculation of juddofelt. A series of erbium doped glasses chlorofluorophosphates were prepared and characterized. Optical properties of er doped alkalichloro phosphate. Juddofelt utility theory is that it provides a theoretical way of determining the spectral line intensity of a transition 5, 6. Experimental and measured oscillator strengths are presented and. Eu nanoparticles was about 4, 57 and 1534 nm, the calculated jo parameter. Judd ofelt theory is a theory in physical chemistry describing the intensity of electron transitions within the 4 f shell of rareearth ions in solids and solutions. System upgrade on feb 12th during this period, ecommerce and registration of new users may not be available for up to 12 hours. Ofelt analysis of rare earth doped magnesium sulfoborate glasses and crystals saddiq abubakar dalhatu a thesis submitted in fulfilment of the requirements for the award of the degree of doctor of philosophy physics faculty of science universiti teknologi malaysia july 2017. Pdf application of a modified juddofelt theory to pr 3. Judd ofelt analysis and optical properties of eu\3. Dec 05, 20 when juddofelt intensity parameters of polynuclear compounds with asymmetric centers are calculated using the current procedure, the results are inconsistent. However, large errors up to 35% can be found on some transitions, even in the case of ions usually considered as well described by the theory.
Ofelt theory the golden and the only one theoretical. Pdf applications of juddofelt theory to praseodymium and. The juddofelt theory describes the intensities of 4f electrons in solids and solutions. Juddofelt theory is a theory in physical chemistry describing the intensity of electron.
A case study with juddofelt theory and single crystal structure analysis and the effect of dehydration on luminescence. Magneticdipole and electricdipole contributions are calculated, in the context of the juddofelt theory, to determine the. According to the juddofelt jo theory, when the size of lapo 4. Judd of the university of california, berkeley, and phd candidate george s. Using a normalized method to fit the experimental data, we show that an average accuracy of 5 to 15% is often obtained. Judd referred to optical absorption, while ofelt referred to crystal spectra, and each to intensities of rareearth ions.
The juddofelt theory is a nonrelativistic model that is based on the. Juddofelt theory analysis and spectroscopic properties of ho. Applications of judd ofelt theory to praseodymium and samarium ions in phosphate glass. The theory was independently developed by judd 25 and ofelt 26 in 1962. An experimentalists view of the formalism and its application. Structural, luminescence and juddofelt analysis to. Caf2 transparent ceramic was measured at room temperature rt. The unit tensor operators that act within the orbital space. The problem arises from the fact that the experimental intensity parameters cannot be determined for each asymmetric polyhedron, and this precludes the individual theoretical adjustment.
Llanosb thestructuralandupconversionpropertiesofbatio. Low this article has been rated as lowimportance on the. Osa spectroscopic study and juddofelt analysis of pr3. The total calculated dipole strength is given by dd 1 2jc1. The relic software package allows the user to calculate intermediatecoupling wavefunctions, energy levels, transition strengths judd ofelt theory, and radiative decay properties of tripositive lanthanide ions in solids. Together, judds and ofelts 1962 papers became known as the juddofelt theory, a term that was first coined by weber in 1967. An extension of the judd ofelt theory, a theoretical model to the field of luminescence intensity ratio method in phosphor thermometry has been presented, that enables a calculation of thermometric figures of merit. Structural properties, juddofelt calculations, and near infrared to. Spectroscopic properties and juddofelt theory analysis of. The year 2012 marked the golden anniversary of the judd. Juddofelt theory the juddofelt jo theory 11,12 has been widely used to calculate the oscillator strength for transitions from ground level to the excited states for re ions implanted in different host. Optical absorption and luminescence properties of sm. Stub this article has been rated as stubclass on the projects quality scale. The juddofelt theory optical interactions in solids.
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