Bright white upconversion luminescence in rare-earth-ion-doped Y2O3 nanocrystals

Chen, G. Y.; Liu, Y.; Zhang, Y. G.; Somesfalean, Gabriel; Zhang, Z. G.; Sun, Quan; Wang, F. P.

doi:10.1063/1.2787893

Cited by 177 publications

(70 citation statements)

References 20 publications

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“…The lanthanide ions such as Er 3+ , Tm 3+ and Ho 3+ have been used as luminescence centers because they have their abundant energy levels for radiative transition, some of which are suitable for direct pumping by NIR (∼980-nm) laser diode [3,4]. The wide applications of upconversion phosphors include three-dimensional displays like flat panel display [5], solid state lasers [6] and solar cell [7].…”

Section: Introductionmentioning

confidence: 99%

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

et al. 2012

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Li + /Tm 3+ /Yb 3+ co-doped CaMoO 4 upconversion (UC) phosphor was prepared by complex citrate-gel method and UC luminescence properties were investigated. Li + /Tm 3+ /Yb 3+ co-doped CaMoO 4 has intense blue emission induced by 1 G 4 → 3 H 6 transition at 476 nm that is improved 10 times more than that of Li + undoped sample and weak red emission at 647 nm generated by 3 F 2 → 3 H 6 transition under excitation at 980 nm. The optimum doping concentration of Li + ions was investigated and UC mechanism of Li + /Tm 3+ /Yb 3+ co-doped CaMoO 4 was discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

et al. 2012

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“…Apparently, the color tends towards the blue region at higher pump powers. This can be explained by the fact that the intensity of the blue UC luminescence increases faster than that of green and red intensities, because blue UC luminescence is a three-photon process, whereas green and red UC luminescences are two-photon processes (33). , and the proposed ET mechanism of UC luminescence.…”

Section: Chromatic Coordinatesmentioning

confidence: 97%

Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals

Lin

Teng

et al. 2014

Luminescence

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NaYF4 micro-crystals with various concentrations of Yb(3+) /Tm(3+) /Ho(3+) were prepared successfully via a simple and reproducible hydrothermal route using EDTA as the chelating agent. Their phase structure and surface morphology were studied using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns revealed that all the samples were pure hexagonal phase NaYF4. SEM images showed that Yb(3+)/Tm(3+)/Ho(3+) tri-doped NaYF4 were hexagonal micro-prisms. Upconversion photoluminescence spectra of Yb(3+)/Tm(3+)/Ho(3+) tri-doped NaYF4 micro-crystals with various dopant concentrations under 980 nm excitation with a 665 mW pump power were studied. Tunable multicolor (purple, purplish blue, yellowish green, green) and white light were achieved by simply adjusting the Ho(3+) concentration in 20%Yb(3+)/1%Tm(3+)/xHo(3+) tri-doped NaYF4 micro-crystals. Furthermore, white-light emissions could be obtained using different pump powers in 20%Yb(3+)/1%Tm(3+)/1%Ho(3+) tri-doped NaYF4 micro-crystals at 980 nm excitation. The pump power-dependent intensity relationship was studied and relevant energy transfer processes were discussed in detail. The results suggest that Yb(3+)/Tm(3+) Ho(3+) tri-doped NaYF4 micro-crystals have potential applications in optoelectronic devices such as photovoltaic, plasma display panel and white-light-emitting diodes.

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“…These processes include cooperative energy transfer [19][20][21][22][23], energy migration [24,25], and cross energy relaxation [26]. For instance, paramagnetic Mn 2+ ions can be used to manipulate the cooperative energy transfer and adjust the fluorescence spectrum of (Yb 3+ , Er 3+ ) co-doped composites.…”

Section: Introductionmentioning

confidence: 99%

Strong tunability of cooperative energy transfer in Mn2+-doped (Yb3+, Er3+)/NaYF4 nanocrystals by coupling with silver nanorod array

et al. 2015

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Fluorescent rare-earth ions are useful for efficient energy transfer via multichannels with different properties. Tuning these transfer processes in functional rare-earth materials has attracted considerable attention to satisfy the various demands of diverse practical applications. In this study, strong tunabilities of cooperative energy transfer and nonlinear upconversion emissions are realized using (Yb 3+ , Er 3+ )/NaYF 4 nanocrystals with and without doped Mn 2+ ions by adopting a plasmonic nanocavity composed of a silver nanorod array. The plasmon nanocavity can not only increase the energy transfer between Mn 2+ and (Yb 3+ , Er 3+ ) but also significantly enhance the radiative emission. This reveals a prominent nonlinear gain in the nanocavity nanosystems. These observations suggest the prospective applications in the design and preparation of rare-earth nanocrystals with excellent tunabilities of multiple functionalities.

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Bright white upconversion luminescence in rare-earth-ion-doped Y2O3 nanocrystals

Cited by 177 publications

References 20 publications

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals

Strong tunability of cooperative energy transfer in Mn2+-doped (Yb3+, Er3+)/NaYF4 nanocrystals by coupling with silver nanorod array

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Bright white upconversion luminescence in rare-earth-ion-doped Y2O3 nanocrystals

Cited by 177 publications

References 20 publications

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

Tunable multicolor and white‐light upconversion luminescence in Yb3+/Tm3+/Ho3+ tri‐doped NaYF4 micro‐crystals

Strong tunability of cooperative energy transfer in Mn2+-doped (Yb3+, Er3+)/NaYF4 nanocrystals by coupling with silver nanorod array

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Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals