Cooperative luminescence in Yb<sup>3 </sup>-doped phosphate glasses

Bell, M.J.V.; Quirino, Welber G.; Oliveira, S. L.; Sousa, D. F. de; Nunes, L.A.O.

doi:10.1088/0953-8984/15/27/319

Cited by 37 publications

(52 citation statements)

References 29 publications

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“…By comparing emissions and transmissions in the infrared and visible ranges, the role and contribution of isolated ions and magnetically coupled pair ions are analyzed. This work constitutes part of the efforts devoted to the study of cooperative luminescence in ytterbium-doped crystals and glasses [16][17][18] with the aim of technological applications, such as optical communications, high-density optical data storage and recently proposed three-dimensional solidstate fluorescence display [19,20].…”

Section: Introductionmentioning

confidence: 99%

Cooperative emission study in ytterbium-doped Y2SiO5

Denoyer¹,

Lévesque²,

Jandl³

et al. 2008

Journal of Luminescence

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Section: Introductionmentioning

confidence: 99%

Cooperative emission study in ytterbium-doped Y2SiO5

Denoyer¹,

Lévesque²,

Jandl³

et al. 2008

Journal of Luminescence

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“…In the inset of the same figure the intensity of the lumi- Figure 4 represent the experimental values. The dependence of the cooperative and near-infrared intensities on Yb 2 O 3 concentration can be determined by means of a rate equation that considers the nonradiative and radiative decays as done in references 15,16 . (1) where N i (i = 1,2) 16 .…”

Section: Resultsmentioning

confidence: 99%

“…The dependence of the cooperative and near-infrared intensities on Yb 2 O 3 concentration can be determined by means of a rate equation that considers the nonradiative and radiative decays as done in references 15,16 . (1) where N i (i = 1,2) 16 . The square dependence of the cooperative luminescence intensity with respect to Yb 3+ concentration is expected for an upconversion process due to pair interaction.…”

Section: Resultsmentioning

confidence: 99%

Blue cooperative emission in Yb3+ - doped GeO2 - PbO glasses

Cacho¹,

Kassab

Oliveira

et al. 2006

Mat. Res.

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Investigation of the blue cooperative luminescence in a binary composition of GeO 2 -PbO glasses with different Yb 3+ concentrations is reported. High refractive index (1.96) and large transmission window (0.4 up to 5.0 µm) are characteristics of this vitreous system. Luminescence and lifetime measurements in the visible and near infrared regions were performed to investigate the spectroscopic characteristics of the glasses. Visible emission around 507 nm was detected in all samples. The visible emission intensity increases with the Yb 2 O 3 content at least up to 2.0 wt. (%), that represents the maximum Yb 2 O 3 concentration possible for this glass system. The visible lifetimes are about half of their respective near infrared ones, and the blue luminescence comes from a cooperative process. A rate equation was used to describe the behavior of the cooperative emission intensity as a function of Yb 2 O 3 concentration; a good agreement with the calculated and measured cooperative luminescence was achieved.

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“…Estes processos são regidos por transferência de energia dos íons de TR para o material hospedeiro. Exemplos de centros com transição não radiativos são: modos vibracionais de rede por carbonilas e hidroxilas e processo de relaxação cruzada (interação íon-íon) (BELL et al, 2003 …”

Section: Concentração (%)unclassified

“…Além disso, os materiais dopados com Yb3+ são de enorme interesse para a próxima geração de lasers de alta potência e também como um sensibilizador de transferência de energia para os lasers de infravermelhos por processo de up-conversion (NEES et al, 1998;DIENING;MOBERT;HUBER, 1988). Várias aplicações são relatadas para a luminescência assistidas em materiais usando Yb3+ como dopantes, como telas tridimensionais planas e biestabilidade intrínseca de comutação óptica (BELL et al, 2003;CACHO, et al, 2006 A matriz SBP foi produzida misturando, em um cadinho de alumina, os óxidos em pó de 40SiO 2 40B 2 O 3 20PbO 2 , nessas proporções e em seguida foram fundidos a uma temperatura de aproximadamente 1300 °C durante 30 minutos. Após esta fase, a matriz foi resfriada a temperatura ambiente sobre uma placa metálica, para facilitar a troca de calor e seu manuseio.…”

Section: Introductionunclassified

Estudo das propriedades ópticas de vidros borosilicatos dopados com íons de Itérbio em função da concentração

et al. 2015

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Rare Earth elements have been studied for different scientific areas due to its excellent spectroscopic and magnetic properties with possible application for construction of different optical and electric devices (MARTINS, 2005;LOURENÇO et al., 2011). In this work, it is studied the optical properties of Ytterbium (Yb 3+ ) ions embedded in a lead-borosilicate glass matrix synthesized by the melting method, using the optical absorption and photoluminescence techniques. The Yb 3+ ions were chosen to dope the glass matrix because it has an energy level scheme more simplified compared with other Rare-Earth ions, with only two energy levels, making it very attractive for the construction of high efficiency optical devices. Increasing the annealing temperature as well as the ion concentration in the matrix leads to a shift of the optical band gap of the matrix to higher energies. We believe that this shift (blueshift) can be associated with the nanocrystallization process of the glass matrix SBP (SiO 2 , B 2 O 3 , PbO 2 ). The reduction of radiative lifetime with increasing ion concentration in matrix was studied using the Stokowski empirical relation, in which, it studies processes of energy transfer as a function of RareEarth concentration. ResumoElementos de Terras-Raras tem sido estudados em diferentes áreas da ciência devido a suas excelentes propriedades espectroscópicas e magnéticas com possível aplicação na construção de diferentes dispositivos ópticos e elétricos (MARTINS, 2005;LOURENÇO et al., 2011). Neste trabalho, estudam-se as propriedades ópticas do íon de Itérbio (Yb 3+ ) inserido em uma matriz vítrea de chumbo-borosilicatos sintetizados pelo método de fusão, através das técnicas de absorção óptica e fotoluminescência. O íon Yb 3+ foi escolhido como dopante, pois este possui um esquema de níveis de energia bastante simplificado quando comparado com os demais íons de Terras-Raras, com apenas dois estados energéticos, que o torna muito atrativo para construção de dispositivos ópticos de alta eficiência quântica. O aumento da temperatura de tratamento térmico assim como o aumento da concentração do íon na matriz leva a um deslocamento do gap óptico da matriz para regiões de maiores energias. Acreditamos que este deslocamento (blue-shift) pode estar associado ao processo de nanocristalização da matriz SBP (SiO 2 , B 2 O 3 , PbO 2 ). A redução do tempo de vida radiativo dos estados excitados do íon, em função do aumento da concentração do íon na matriz, foi analisada através da relação empírica de Stokowski, a qual, estuda processos de transferência de energia com a variação da concentração dos íons de TR DOI: 10.5433/1679-

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Cooperative luminescence in Yb³-doped phosphate glasses

Cited by 37 publications

References 29 publications

Cooperative emission study in ytterbium-doped Y2SiO5

Cooperative emission study in ytterbium-doped Y2SiO5

Blue cooperative emission in Yb3+ - doped GeO2 - PbO glasses

Estudo das propriedades ópticas de vidros borosilicatos dopados com íons de Itérbio em função da concentração

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Cooperative luminescence in Yb3 -doped phosphate glasses

Cited by 37 publications

References 29 publications

Cooperative emission study in ytterbium-doped Y2SiO5

Cooperative emission study in ytterbium-doped Y2SiO5

Blue cooperative emission in Yb3+ - doped GeO2 - PbO glasses

Estudo das propriedades ópticas de vidros borosilicatos dopados com íons de Itérbio em função da concentração

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Cooperative luminescence in Yb³-doped phosphate glasses