Study on strong cooperative upconversion luminescence of ytterbium-ytterbium clusters in oxyfluoride glass

Chen, Xiaobo; Song, Li; Song, Zengfu; Du, Weimin; Ou, Wen; Sawanobori, Naruhito

doi:10.1364/josab.23.002581

Cited by 14 publications

(7 citation statements)

References 19 publications

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“…First, isolated Yb 3+ ions are optically or electrically excited to the 2 F 5/2 state from the 2 F 7/2 ground state. Then, two excited Yb 3+ ions form a coupled cluster state 2 F 5/2 2 F 5/2 and the blue cooperative luminescence is caused by a transition from the excited coupled state 2 F 5/2 2 F 5/2 to the ground coupled state 2 F 7/2 2 F 7/2 [14]. This process is strongly enhanced by increasing the Yb concentration.…”

Section: Resultsmentioning

confidence: 99%

Electroluminescence from Er and Yb co-doped silicon dioxide layers: The excitation mechanism

Prucnal

Rebohle

Skorupa

2011

Journal of Non-Crystalline Solids

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Section: Resultsmentioning

confidence: 99%

Electroluminescence from Er and Yb co-doped silicon dioxide layers: The excitation mechanism

Prucnal

Rebohle

Skorupa

2011

Journal of Non-Crystalline Solids

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“…levels of Tm 3+ . 36 The 1 D 2 level of Tm 3+ cannot be populated by the fourth photon from Yb 3+ via energy transfer to the 1 G 4 due to the large energy mismatch (about 3500 cm À1 ) between them. 37 The cross-relaxation between Tm 3+ ions may be responsible for populating the 1 D 2 level.…”

Section: Photoluminescencementioning

confidence: 99%

“…Usually, there are primarily two cross-relaxation processes in populating the 1 D 2 level: 3 F 2 + 3 H 4 -3 H 6 + 1 D 2 and 1 G 4 + 3 H 4 -3 F 4 + 1 D 2 . 36,38,39 On the other hand, the 1 D 2 state may be promoted to the 3 P 2 state via another energy transfer from excited Yb 3+ , and then nonradiatively relax to the 1 I 6 level (Scheme 1).…”

Section: Photoluminescencementioning

confidence: 99%

Near-infrared photocatalysis of β-NaYF4:Yb3+,Tm3+@ZnO composites

Guo

Song

Chen

et al. 2013

Phys. Chem. Chem. Phys.

107

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A novel near-infrared (NIR)-responsive photocatalyst, β-NaYF4:Yb(3+),Tm(3+)@ZnO composites, was prepared by a two-step high temperature thermolysis method. In the NIR-responsive photocatalysis, β-NaYF4:Yb,Tm served as a NIR-to-UV upconverter and provided "UV light" or "necessary energy" to the ZnO catalyst. The energy transfer in the composites and the mixtures of β-NaYF4:Yb,Tm and ZnO was studied by using steady-state and dynamic fluorescence spectroscopy. The NIR photocatalytic activities were investigated by the decomposition of Rhodamine B. It was found that the energy transfer processes dominated the overall photocatalytic activities, and the generation of hydroxyl radicals was the origin of organic pollutant decomposition under NIR irradiation.

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“…Inspired by the pioneering work by Auzel [ 29 ] on solid‐state materials, [ 30,31 ] we reported the first example of solution‐state molecular cooperative luminescence (CL) using a Yb 9 cluster. [ 32 ] This entails double excitation of two proximate Yb III ions at 980 nm which produces emission from a virtual excited state at 503 nm via a two‐photon process (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

“…[17,26] This approach, despite its effectiveness, is onerous due to the similar chemical reactivity between lanthanides, [27,28] as is the case for mixed Yb/Tb systems, which constrains the synthetic accessibility. [15,16] Inspired by the pioneering work by Auzel [29] on solid-state materials, [30,31] we reported the first example of solution-state molecular cooperative luminescence (CL) using a Yb 9 cluster. [32] This entails double excitation of two proximate Yb III ions at 980 nm which produces emission from a virtual excited state at 503 nm via a two-photon process (Figure 1b).…”

mentioning

confidence: 99%

Solution‐State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers

Soro

Knighton

Avecilla

et al. 2022

Advanced Optical Materials

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anti-Stokes emission, UC is a process of choice for bio-analytical applications, removing spurious signals originating from autofluorescence of the samples and light scattering. Consequently, UC has found many applications such as in microscopy and photodynamic therapy, [2] remote cellular activation, [3] or bioassays. [4,5] However, these processes are typically observed in solid-state materials [6] or nanoparticles, [7] but a seminal example of energy transfer UC (ETU) at the molecular scale was reported by Piguet and co-workers in 2011, which consisted of a triply stranded Cr III -Er III -Cr III helicate. [8,9] In the subsequent years this has been expanded to encompass a range of discrete upconverting systems, operating by excited state absorption (ESA), [10][11][12] energy transfer UC, or cooperative sensitizaton (CS). [15][16][17][18] At the molecular scale, much attention must be paid to minimize quenching due to the increased prevalence of nonradiative de-excitation processes from molecules in solution, primarily through OH, NH, and CH oscillators in the first or second coordination sphere. [20][21][22] This is achieved by using sterically encumbering ligand systems, [23] deuteration of the ligand scaffold, [16] or using perdeuterated solvents. [16,24,25] One key impediment in the development of new molecular UC devices is the typical requirement to prepare heterometallic polyads, as is the case with CS systems comprising two or more Yb III sensitizers around Tb III or Ru II acceptors (Figure 1a). [17,26] This approach, despite its effectiveness, is onerous due to the similar chemical reactivity between lanthanides, [27,28] as is the case for mixed Yb/Tb systems, which constrains the synthetic accessibility. [15,16] Inspired by the pioneering work by Auzel [29] on solid-state materials, [30,31] we reported the first example of solution-state molecular cooperative luminescence (CL) using a Yb 9 cluster. [32] This entails double excitation of two proximate Yb III ions at 980 nm which produces emission from a virtual excited state at 503 nm via a two-photon process (Figure 1b). While it is a key tenet of UC processes that the efficiency of UC is improved using more donor ions, there also remains the possibility of concentration quenching, which has been observed in nanoparticles. [33,34] Furthermore, the two-photon power dependence of the UC observed in homo-nonanuclear Yb 9 clusters supports the accepted mechanism of the requirement of only two proximate Yb III ions. Conclusive confirmation of this dinuclear mechanism can only occur through removal of the extraneous Yb III donors to its fundamental form in a dimeric Yb 2 system (lex parsimoniae). This strategy is not feasible in either Two homometallic ytterbium dimers are prepared and their solution-state photoluminescence and upconversion properties are investigated. Both complexes exhibit two-photon cooperative luminescence upconversion in the visible region (λ em ≈ 510 nm) upon excitation into the near-infrared Yb 2 F 5/2 ← 2 F 7/2 absorption band at 98...

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Study on strong cooperative upconversion luminescence of ytterbium-ytterbium clusters in oxyfluoride glass

Cited by 14 publications

References 19 publications

Electroluminescence from Er and Yb co-doped silicon dioxide layers: The excitation mechanism

Electroluminescence from Er and Yb co-doped silicon dioxide layers: The excitation mechanism

Near-infrared photocatalysis of β-NaYF4:Yb3+,Tm3+@ZnO composites

Solution‐State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers

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