Enhanced green and red upconversion and 2.7μm emission from Er3+/Tm3+ co-doped bismuth germanate glass

Zhao, Guoying; Kuan, Pei-Wen; Fan, Huiyan; Hu, Lili

doi:10.1016/j.optmat.2012.11.009

Cited by 28 publications

(11 citation statements)

References 18 publications

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“…According to Jϕrgensen and Reisfeld33, Ω 2 is strongly affected by covalency and Ω 6 is closely related to the rigidity of glass host. As is shown in Table 3, the obtained Ω 2 values in this work are both higher than those of fluorophosphate, bismuthate and fluoride glasses172434, and comparable to that of other germanate glass35. This behavior is derived from the more covalent nature of germanate glass.…”

Section: Resultssupporting

confidence: 72%

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Wei

Chen

Cai

et al. 2014

Sci Rep

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Er3+ doped Y2O3 and Nb2O5 modified germanate glasses with different Er3+ concentrations were prepared. J-O intensity parameters were computed to estimate the structural changes due to the additions of Y2O3 and Nb2O5. The main mid-infrared spectroscopic features were investigated. To shed light on the observed mid-infrared radiative behavior, 975 nm and 1.53 μm emission spectra along with their decay lifetimes were also discussed. Moreover, the energy transfer processes of 4I11/2 and 4I13/2 level were quantitatively analyzed. In view of the experimental lifetimes, the simplified rate equation was utilized to calculate the energy transfer upconversion processes of upper and lower laser level of 2.7 μm emission. The theoretical calculations are in good agreement with the observed 2.7 μm fluorescence phenomena. Finally, the stimulated emission and gain cross sections were calculated and the results indicate that Er3+ doped germanate glasses have great potential for mid-infrared application.

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Section: Resultssupporting

confidence: 72%

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Wei

Chen

Cai

et al. 2014

Sci Rep

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“…) at excitation laser power density as low as 1.16 W/cm 2 . NIR to visible upconversion via sensitized luminescence in Tm 3+ and Er 3+ co‐doped various host materials has been reported in several literatures . Our visual and spectroscopic observations show that efficient upconversion photoluminescence can be achieved in Tm 3+ and Er 3+ co‐doped α‐Sialon ceramics as well.…”

Section: Resultssupporting

confidence: 73%

“…NIR to visible upconversion via sensitized luminescence 40,41 in Tm 3+ and Er 3+ codoped various host materials has been reported in several literatures. 8,9,42,43 Our visual and spectroscopic observations show that efficient upconversion photoluminescence can be achieved in Tm 3+ and Er 3+ co-doped a-Sialon ceramics as well. The reason for the observed efficient upconversion is the co-existence of Er 3+ and Tm 3+ ions in the lattice of a-Sialon.…”

Section: Transmission and Absorption Spectramentioning

confidence: 62%

“…This implies the occurrence of the energy‐transfer process ET2. The efficiency of the energy transfer from Er 3+ : 4 I 13/2 to Tm 3+ : 3 F 4 manifold via the ET2 process can be calculated by the following equation

η = 1 - \frac{τ_{normalEr false/ normalTm}}{τ_{Er}}

where, τ Er/Tm and τ Er , are the lifetimes of Er 3+ : 4 I 13/2 manifold with and without Tm 3+ ions, respectively . Using respective lifetimes in Eq.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, tremendous efforts have been paid for the investigation of near‐infrared (NIR) to visible frequency upconversion in lanthanide (Ln 3+ )‐doped transparent materials due to their wide range of applications including solid‐state lasers, lighting and display devices, solar cells, NIR quantum counting devices, components in optical telecommunications, and so on. Various transparent upconversion host materials in the form of single crystals, films, and glasses have been extensively investigated. Recently, due to the improved fabrication technologies to produce photonic quality materials in large scales, transparent ceramic materials such as yttria and yttrium aluminum garnet (YAG) are now replacing single crystals and glasses as upconversion host material for photonic and optical applications .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm³⁺, Er³⁺)‐α‐Sialon Ceramics

et al. 2016

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Intense visible and near‐infrared frequency upconversion and a frequency downconversion photoluminescence have been reported for the first time in Tm3+ and Er3+ co‐doped transparent α‐Sialon ceramics under 980 nm excitation. The α‐Sialon ceramics were prepared by hot‐press sintering technique. Intense upconversion bands at 554, 678, 803 nm, and a downconversion band at 1530 nm were observed as a result of the efficient energy transfer between Er3+ and Tm3+ ions. The quadratic dependence of upconversion intensities on the excitation power indicates that the upconversion process is governed by two‐photon absorption process. The sintered samples of thickness 0.20 mm have transparency above 80% in the range of 2000 to 4200 nm and it reaches as high as 82% at 3350 nm. Moderately low phonon energy was found with the highest frequency band at 828 cm−1. These novel properties manifest the potential applications of transparent α‐Sialon ceramics as a multifunctional material.

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Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes

Hao

et al. 2017

Luminescence

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Improving the emission from rare earth ions doped materials is of great importance to broaden their application in bio-imaging, photovoltaics and temperature sensing. The green emissions of , the enhancement mechanism was discussed. Moreover, the result of temperature-dependent enhancement revealed that the enhancement factor reached its maximum (2.5) as the sample heated to 120°C, which is due to the competition of two major thermal effects acting in the co-excited up-conversion processes.In addition, the same enhancement of green emissions was also observed in [4] and in vitro/in vivo biological application. [5][6][7] However, because of their small absorption cross-section, the up-converting luminescence is not strong enough in many practical applications. To overcome this drawback, Yb 3+, acted as sensitizer, has been co-doped into the materials to transfer 980 nm energy to Ln 3+ . [8,9] Intriguingly, the luminescence can also be enhanced through the core-shell structure, which can eliminate energy dissipation to nanoparticle' surface. [10][11][12] Surface plasmon resonance of noble metals has been used to overcome this drawback. [13][14][15] Moreover, the up-converting luminescence can also be improved under co-excited condition with two different wavelength lasers. [16][17][18][19] Several groups have analyzed the luminescent behaviors of Er 3+ / Yb 3+ co-doped materials for they show strong green emissions. [20][21][22] Besides the sensitizer and activator, the host matrix also plays an important role in up-conversion luminescence. Because of its low toxicity, thermal stability and high photo-chemical stability, [23][24][25][26] Gd 2 (MoO 4 ) 3 was chosen as the host matrix in our work.In this work, we greatly increase the green emissions of Abbreviations used: I 980 , the integral intensity of green emissions under excitation with a 980 nm; I 808 , the integral intensity of green emissions under excitation with a 808 nm laser; I 980+808 , integral intensity of green emissions under co-excitation with both the 980 and 808 nm lasers; TEM, transmission electron microscopy; XRD, X-ray diffraction.

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Enhanced green and red upconversion and 2.7μm emission from Er3+/Tm3+ co-doped bismuth germanate glass

Cited by 28 publications

References 18 publications

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm³⁺, Er³⁺)‐α‐Sialon Ceramics

Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes

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Enhanced green and red upconversion and 2.7μm emission from Er3+/Tm3+ co-doped bismuth germanate glass

Cited by 28 publications

References 18 publications

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Mid-infrared fluorescence, energy transfer process and rate equation analysis in Er3+ doped germanate glass

Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm3+, Er3+)‐α‐Sialon Ceramics

Enhanced green emissions of Er3+/Yb3+ co‐doped Gd2(MoO4)3 by co‐excited up‐conversion processes

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Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm³⁺, Er³⁺)‐α‐Sialon Ceramics

Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes