Upconversion in La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Tm</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Huang, Shihua; Lai, Shui T.; Lou, Liren; Jia, Wei; Yen, W. M.

doi:10.1103/physrevb.24.59

Cited by 53 publications

(22 citation statements)

References 10 publications

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“…A theoretical approach that takes the absorption cross-section into account, which depends on the phonon occupation number, has proven to agree very well with the experimental data [48,54,59]. In the present ESA (ground state absorption (GSA)) process, when the excited energy is higher (lower) than its absorption energy, the energy difference is provided via phonons from lattice.…”

Section: Resultsmentioning

confidence: 60%

“…2 presents temperature dependent emission spectra of Tm 3þ doped LaF 3 NPs. The emission spectra from LaF 3 : Tm 3þ NPs at different temperatures are dominated by NIR luminescence around 800 nm from 3 H 4 to the ground state 3 H 6 [48]. Blue luminescence transitions around 453 nm that account for less than 10% of the intensity, corresponding to the 1 D 2 / 3 H 4 transition, are significantly weak [49].…”

Section: Resultsmentioning

confidence: 98%

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Spectral tuning via multi-phonon-assisted stokes and anti-stokes excitations in LaF3: Tm3+ nanoparticles

Gao

Tian

Chong

et al. 2016

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 98%

Spectral tuning via multi-phonon-assisted stokes and anti-stokes excitations in LaF3: Tm3+ nanoparticles

Gao

Tian

Chong

et al. 2016

Journal of Alloys and Compounds

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“…3 H 6 as a function of excitation power in 500-nm nanobundles. We can see that s increased with the increase of excitation power, which can be explained by the expanded study of rate equation [32]. Let g represent the radiative transition rate of 3 H 4 !…”

Section: Uc Luminescence From Yf 3 :Yb 3+ (20%)/tm 3+ (1%) Nanobundlementioning

confidence: 94%

Size-dependent upconversion luminescence in YF3:Yb3+/Tm3+ nanobundles

Wang

Qin

et al. 2008

Journal of Fluorine Chemistry

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“…Samples with higher Tm 3+ content display a clearly non-exponential faster decay, due to concentration-quenching effects occurring via cross-relaxation between ions. [11,32,33] The thulium-based materials reported here display broad RT infrared emission in the range 1360 to 1565 nm. For example, the spectrum of Na 3 TmSi 3 O 9 consists of two series of lines, within the E-, S-, and C-bands, assigned to the (Fig.…”

Section: Receivedmentioning

confidence: 98%

Multifunctional Sodium Lanthanide Silicates: From Blue Emitters and Infrared S‐Band Amplifiers to X‐Ray Phosphors

Ananias

Ferreira

Carlos³

et al. 2003

Advanced Materials

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In addition to photoluminescence, pyrene molecules also display electroluminescence (EL).[15] The electrical conductivity of the pyrene-embedded PPy nanoparticles was 3.5 S cm ±1 .In EL devices, a PPy conducting layer can be used as a good hole-transporting layer (HTL). In general, EL devices doped with PPy as the HTL yield higher luminance efficiencies and lower turn-on voltages. [16] It seems that a pyrene-embeddedPPy nanoparticle layer could be utilized as a good HTL (owing to the conducting ability of PPy) and also as an emitting layer (EML) due to the EL properties of pyrene. Pyrene-embedded PPy nanoparticles can therefore be called HTL/EML nanohybrids. In addition, the emission color can be tuned by introducing other organic dyes, such as rhodamine B (red) and fluorescein (green).In conclusion, photochromic dye±conducting polymer core± shell nanomaterials were fabricated using microemulsion micelles as nanoreactors. PPy nanoparticles (7±13 nm in diameter) embedded with a pyrene core were successfully synthesized. As the pyrrole monomer polymerized, pyrene molecules were phase-separated and gathered together toward the interior of the micelle. The adsorption state of pyrene was tunable over a wide range with a small amount of pyrene, because of the nanosized reaction site of the micelles and the packing constraint of pyrene crystal. The emission colors of the nanohybrids were controllable from violet to blue by changing the amount of embedded pyrene. Our methodology provides a facile and effective way for controlling the adsorption state of organic dyes, and also presents a new concept in use of the HTL/EML nanohybrids in EL devices. ExperimentalSynthesis of Pyrene-Embedded PPy Nanoparticles: 3 g of decyltrimethylammonium bromide (DeTAB) was magnetically stirred in 40 mL of H 2 O at 3 C. Pyrene, in quantities of 0.5, 3, 5, and 10 mg, was mixed into 1.0 g (14.9 mmol) of pyrrole monomer. The mixture was added dropwise to the surfactant solution. FeCl 3 (5.561 g, 34.3 mmol) was dissolved in a small amount of distilled water and the solution was added to the reaction mixture. Chemical polymerization proceeded for 3 h at 3 C. The reaction product was moved to a separating funnel and excess methyl alcohol was added to remove the surfactant and residual ferric chloride. A small amount of isooctane was added to promote the precipitation of the PPy nanoparticles, owing to the enhanced hydrophobicity. The upper solution containing surfactant and unreacted ferric chloride was discarded and the nanoparticle precipitate was dried in a vacuum oven at room temperature. For comparison, pure PPy nanoparticles, without any embedded pyrene, were also synthesized. For the photoluminescence experiments, pyrene and pyrene-embedded PPy nanoparticles were dispersed in benzene and methyl alcohol (spectrophotometric grade), respectively.Instrumental Analysis: The TEM images and EDX data were taken using a Philips CM-20 microscope coupled with an EDX facility. Emission spectra were obtained with a Shimadzu RF-5301 PC spectrofluorophot...

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Upconversion in LaF3:Tm3+

Cited by 53 publications

References 10 publications

Spectral tuning via multi-phonon-assisted stokes and anti-stokes excitations in LaF3: Tm3+ nanoparticles

Spectral tuning via multi-phonon-assisted stokes and anti-stokes excitations in LaF3: Tm3+ nanoparticles

Size-dependent upconversion luminescence in YF3:Yb3+/Tm3+ nanobundles

Multifunctional Sodium Lanthanide Silicates: From Blue Emitters and Infrared S‐Band Amplifiers to X‐Ray Phosphors

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