The luminescent quantum efficiency of Cr3+ ions in Cs2NaAlF6 single crystals

Torchia, G. A.; Schinca, Daniel Carlos; Хайдуков, Н.М.; Tocho, Jorge O.

doi:10.1016/s0925-3467(02)00091-5

Cited by 29 publications

(30 citation statements)

References 18 publications

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“…Of more interest is the fact that based on the results presented here, we can infer to the 1.0 at% of Cr 3 þ doped sample a good impurity concentration for the generation of luminescence, due its high quantum yield. Assuming that the emission quantum yield at 5 K is 100%, we obtain a room temperature quantum yield for this sample of about 0.78; in other samples, such as Be 3 Al 2 (SiO 3 ) 6 :Cr 3 þ , this value is about 0.64 [44], in a system similar to the present study, LiCaAlF 6 :Cr 3 þ the quantum yield is 0.54 [45], and for the same system studied in the present work, but doped with 0.5% at Cr 3 þ this efficiency is 0.68 [24]. Therefore, this high quantum yield value shows that this system doped with low quantities of impurity ion can be considered an excellent candidate in future applications in lasing devices.…”

Section: Discussionsupporting

confidence: 83%

“…In addition, broad bands are produced by transitions between energy levels with different electronic configurations, while narrow bands are generated by transitions between levels with the same electronic configuration [19] e) levels generate narrow and weak bands. In this paper we have performed an extensive study of the optical properties of the elpasolite Cs 2 Na AlF 6 , complementing previous works of the other authors about the energy levels [20], EPR experiments [21,22], absorption and emission [23], and quantum efficiency of the system by photoacoustic spectroscopy [24].…”

Section: Introductionmentioning

confidence: 78%

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Effects of Cr3+ concentration on the optical properties of Cs2NaAlF6 single crystals

Pedro

Sosman

Barthem

et al. 2013

Journal of Luminescence

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a b s t r a c tThis work is devoted to the study of optical properties of the elpasolite Cs 2 NaAlF 6 with 0.1, 1.0, 3.0, 10.0, 30.0 and 50.0% of Cr 3 þ ions. The interest in this system lies on the fact that it presents a high quantum yield in the visible and infrared regions and therefore can be considered for laser applications. The photoluminescence and excitation spectra were obtained at 5 and 300 K, while the absorption spectra were measured at 300 K. The spectra at 300 K show broad bands attributed to the Cr 3 þ ions in two non-equivalent sites, both of them with octahedral coordination, while at 5 K we can observe the vibrational modes of the [CrF 6 ] 3 À complex. The ensemble of our results lead us to conclude that the material has potential applications as a lasing system.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 78%

Effects of Cr3+ concentration on the optical properties of Cs2NaAlF6 single crystals

Pedro

Sosman

Barthem

et al. 2013

Journal of Luminescence

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“…A review of photoacoustic methods is given by Rosencwaig (1980), Patel and Tam (1981), Tam (1986), and Almond and Tam (1996); an example for nonradiative relaxation of a transition metal in fluorides Fig. 6 Linear thermal expansion coefficients of Ge, GaAs, and ZnSe; after Novikova 1966 Semiconductor Physics DOI 10.1007/978-3-319-06540-3_5-1 # Springer International Publishing Switzerland 2014 measured using photoacoustic spectroscopy is given by Torchia et al (2002), and the ultrafast dynamics of surface expansion and thermal diffusivity is reported by Pennington and Harris (1992).…”

Section: Photothermal Expansionmentioning

confidence: 99%

Phonon-Induced Thermal Properties

Böer

Pohl

2014

Semiconductor Physics

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Phonons are responsible for all thermal properties of a solid, such as its heat content and transport. The anharmonic part of lattice oscillations causes thermal expansion. All these are integral contributions of the phonon spectrum; only at low temperatures, where part of the spectrum can be frozenout, do they become partially spectrum selective. Thermal conductivity is determined by various mechanisms of phonon scattering. KeywordsFrozen-out; heat content; phonon scattering; thermal conductivity; thermal expansion; transport Heat CapacityThere are three macroscopic thermal properties originating from phonons:• Heat capacity • Thermal expansion • Thermal conductivity neglecting electronic contributions here. Since these are easily observable effects, they were studied early, and rather general, often semiempirical descriptions were given. These properties are of interest with regard to the interaction of electrons with phonons and the dissipation of energy, e.g., in optical excitation. The first set of processes is discussed in chapters "▶ Carrier Scattering at Low Fields" and "▶ Carrier Scattering at High Fields." The latter processes are kinetic in nature and are discussed in chapters "▶ Carrier Transit and Relaxation" and "▶ Phonon and Exciton Kinetics." In this chapter we will provide the essential basic information.Heat capacity is a measure of the content of thermal energy, which is stored in all active oscillations of atoms in the solid. The specific heat (or specific heat capacity) expresses the change *Email: pohl@physik.tu-berlin.de 1 Although the specific heat is measured more easily for constant pressure C P , the difference between C V and C P is very small for solids and is given bywhere a is the thermal expansion coefficient, k is the isothermal compressibility, and V m is the molar volume.Semiconductor Physics

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“…19, giving the value f = 100%. The same method applied for determina− tion of the quantum efficiency of Cr 3+ ion luminescence in Cs 2 NaAlF 6 crystals gave the value f = 69% [20]. An appli− cation of the SIMPLE method enabled also determination of the quantum efficiency of the luminescence of Cr 3+ ions in LiNbO 3 :ZnO crystals and gave the value f = 10% [21].…”

Section: Introductionmentioning

confidence: 98%

Photoacoustic method of determination of quantum efficiency of luminescence in Mn2+ ions in Zn1−x−yBexMnySe crystals

Maliński

Chrobák

Zakrzewski

et al. 2011

Opto-Electronics Review

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This paper presents step by step the procedure of determination of the quantum efficiency of luminescence of Mn2+ ions in the Zn1−x−yBexMnySe crystals. The method is based on the photoacoustic spectroscopy approach. In the paper, the experimental spectra of absorbance, transmission, absorption and photoacoustic spectra of the samples are presented and analyzed from the point of view of the possibility of determination of the quantum efficiency of Mn2+ ion luminescence at room temperature. It was determined experimentally that in the investigated crystals the quantum efficiency of luminescence in the Mn2+ ions is about 35%, 40%, 32% for the absorption peaks at 430 nm, 470 nm, and 510 nm, respectively, for Zn0.75Be0.2Mn0.05Se crystal.

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The luminescent quantum efficiency of Cr3+ ions in Cs2NaAlF6 single crystals

Cited by 29 publications

References 18 publications

Effects of Cr3+ concentration on the optical properties of Cs2NaAlF6 single crystals

Effects of Cr3+ concentration on the optical properties of Cs2NaAlF6 single crystals

Phonon-Induced Thermal Properties

Photoacoustic method of determination of quantum efficiency of luminescence in Mn2+ ions in Zn1−x−yBexMnySe crystals

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