Transition Metal and Rare Earth Compounds

doi:10.1007/3-540-44474-2

Cited by 8 publications

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“…It is well established that suitable host material for UCPL should have low intrinsic phonon energy because the phonons (or lattice vibration) of the host can provide non-radiative decay ways to suppress UCPL. 7 Recently, oxides or oxysalts with high chemical stability and low phonon energy, such as Gd 2 O 3 , Y 2 O 3 , YAlO 3 , Y 3 Al 5 O 12 , NaNbO 3 and La(MoO 4 ) 3 etc., existing in the form of nanocrystal, crystal (or polycrystalline) and ceramics 8−24 as the host for UCPL materials have been studied extensively. GdAlO 3 is a perovskite-structured material with good chemical stability and low cutoff phonon energy (∼580 cm −1 ) 25 and hence should be a suitable host for UCPL.…”

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Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor

Deng

Yan

2014

ECS J. Solid State Sci. Technol.

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GdAlO 3 :1.5%Er 3+ ,8%Yb 3+ phosphors were prepared by calcining the precipitate precursor at different temperatures. Effects of calcination temperature on the phase composition, morphology, light absorption and up-conversion photoluminescence properties of the phosphors were investigated. It was found that the phosphors prepared at a temperature between 1000 and 1400 • C kept perovskite structure. With increasing calcination temperature, the crystallinity of the phosphor improved along with the increased particle size. The absorption at 977 nm increased while the concentration of residual OH − decreased with increasing calcination temperature. Under 980 nm excitation, the intensity of green emission at a wavelength of 546 nm increased nearly linearly with increasing calcination temperature when the calcination temperature of the phosphor was between 1000 and 1300 • C, accompanied by gradually decreased ratio of red-to-green emission. Based on the FT-IR spectra and energy levels of Er 3+ and Yb 3+ , possible reasons causing changes in green emission intensity and the ratio of red-to-green with the calcination temperature of the phosphor were discussed. The nearly linear response of the red-to-green emission ratio of the GdAlO 3 :Er 3+ ,Yb 3+ phosphor to the calcination temperature at which it endured during preparation makes the precipitate precursor GdAlO 3 :Er 3+ ,Yb 3+ to be a promising candidate for upconversion thermal history sensing material. In recent years, frequency up-conversion materials that convert infrared to visible light have attracted much attention for their potential applicability in many fields, such as solid-state lasers, biological fluorescence labels, fiber-optic amplifiers, and photovoltaic devices. 1−4Most of the up-conversion photoluminescence (UCPL) materials that have been extensively studied are rare-earth doped halides, oxyhalides and glasses.1,5−6 Although the conversion efficiency of the fluoridebased UCPL materials has been improved to a considerable level, the application is still greatly restricted because of high production cost and poor chemical stability. Therefore, it is of great significance to seek for new hosts with high-conversion efficiency. It is well established that suitable host material for UCPL should have low intrinsic phonon energy because the phonons (or lattice vibration) of the host can provide non-radiative decay ways to suppress UCPL. 29 It was found that the GdAlO 3 :Er 3+ ,Yb 3+ phosphors prepared by different methods showed unlike morphologies and particle sizes, which led to distinct absorption strengths for 980 nm radiation. Moreover, the concentration of residual CO 3 2− and OH − species in the GdAlO 3 :Er 3+ ,Yb 3+ phosphors prepared by different methods was quite different. Since vibrational frequencies of these species were significantly higher than that of GdAlO 3 host, the existence of these species resulted in multi-phonon non-radiative relaxation of the excited states of Er 3+ ion. Therefore, green UCPL intensity and the z E-mail: sryan@fuda...

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confidence: 99%

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor

Deng

Yan

2014

ECS J. Solid State Sci. Technol.

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Synthesis, Air Stability, Photobleaching, and DFT Modeling of Blue Light Emitting Platinum CCC-N-Heterocyclic Carbene Pincer Complexes

et al. 2012

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The recently reported metalation/transmetalation route for the synthesis of CCC-bis(NHC) pincer ligand supported transition-metal complexes was extended to Pt. 2-(1,3-Bis(N-butylimidazol-2-ylidene)phenylene)(chloro)platinum(II) (1) and its bromo analogue 2 were synthesized and characterized. X-ray crystal structure determinations revealed complexes 1 and 2 to have distorted-square-planar configurations around the metal. Photophysical and thermal properties of these complexes are reported, and their extended photostability in air is discussed and contrasted. Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) computations of the ground state and various low-lying excited states have revealed admixing of Pt 5d orbitals and the ligand π* orbitals for both the ground state and the low-lying excited states of complex 1, indicating the low-lying states to be a mixture of metal-to-ligand charge-transfer and ligand-centered transition (MLCT-LC). Somewhat surprisingly, the computed gas-phase geometry of the excited state of complex 1 had a significant distortion, mostly about the Caryl–Pt–Cl angle. These complexes were congeners of materials for organic light emitting diodes (OLEDs).

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TADF for singlet harvesting: next generation OLED materials based on brightly green and blue emitting Cu(I) and Ag(I) compounds

2014

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Transition Metal and Rare Earth Compounds

Cited by 8 publications

References 61 publications

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor

Synthesis, Air Stability, Photobleaching, and DFT Modeling of Blue Light Emitting Platinum CCC-N-Heterocyclic Carbene Pincer Complexes

TADF for singlet harvesting: next generation OLED materials based on brightly green and blue emitting Cu(I) and Ag(I) compounds

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Transition Metal and Rare Earth Compounds

Cited by 8 publications

References 61 publications

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO3: Er3+,Yb3+Phosphor

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO3: Er3+,Yb3+Phosphor

Synthesis, Air Stability, Photobleaching, and DFT Modeling of Blue Light Emitting Platinum CCC-N-Heterocyclic Carbene Pincer Complexes

TADF for singlet harvesting: next generation OLED materials based on brightly green and blue emitting Cu(I) and Ag(I) compounds

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Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor

Effect of Calcination Temperature on Up-Conversion Photoluminescence of the GdAlO₃: Er³⁺,Yb³⁺Phosphor