Fabrication and electron transport properties of epitaxial films of electron-doped 12CaO·7Al2O3 and 12SrO·7Al2O3

Miyakawa, Masashi; Hiramatsu, Hidenori; Kamiya, Toshio; Hirano, Masahiro; Hosono, Hideo

doi:10.1016/j.jssc.2009.11.031

Cited by 20 publications

(16 citation statements)

References 28 publications

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“…It can be noted that the lattice constant a increases from 11.976 A (x=0.00) to 11.980 A (x=0.48) and the unit cell volume V increases as the Sr dopant amount rises. This result indicates that the nanocage size of the Sr-doped sample indeed becomes larger than that of the undoped sample, which is consistent with that reported by Miyakawa et al 17 To confirm the composition of the samples, EDX spectra and morphologies of Ca 11.94Àx Sr x Al 14 O 33 :Eu 0.06 powders are given in Figure 2B. For the undoped sample (x=0.00), O, Al and Ca elements can be observed.…”

Section: Resultssupporting

confidence: 88%

“…12 On the other hand, the reported study showed that Sr 12 Al 14 O 33 (S12A7) has a similar structure to Ca 12 Al 14 O 33 and a larger lattice constant (a=1.233 nm) than Ca 12 Al 14 O 33 (a=1.199 nm). 17 According to the above results, Zhang et al found that Sr doping in Gd 3+ -doped Ca 12(1-x) Sr 12x Al 14 O 33 powders could give rise to the enhancement of the exchange, formation and annihilation of various encaged anions. 18 Thus, the numbers of encaged H À , OH À anions and electrons created by UV-light irradiation increased with increasing the amount of Sr in the presence of the stable trivalent rare earth ions like Gd 3+ ion.…”

Section: Introductionmentioning

confidence: 96%

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Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

et al. 2017

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Control of light-induced electron generation is of vital importance for the application of caged phosphors. For Eu-doped Ca 11.94Àx Sr x Al 14 O 33 caged phosphors, the suppressed effect of strontium doping on the light-induced electrons is observed compared to the europium-free Ca 11.94Àx Sr x Al 14 O 33 phosphors. In the presence of europium ions, Sr doping will promote the reduction of Eu 3+ to Eu 2+ . The Rietveld refinement suggests that unit cell volumes of the Ca 11.94Àx Sr x Al 14 O 33 :Eu 0.06 samples are expanded when Ca 2+ ions are replaced by Sr 2+ ions. The absorption and FTIR transmittance spectra confirm that the competitive reaction of encaged O 2À anions with H 2 is suppressed. For the sample (x=0.48), the higher thermal activation energy (~0.40 eV) for luminescence quenching can be attributed to the more rigid framework structure after Sr doping. For Ca 11.94Àx Sr x Al 14 O 33 :Eu 0.06phosphors, their emission colours are tuned from red to purple upon 254 nm excitation and from pink to blue under electron beam excitation through Sr substitution. The insight gained from this work may have a significant guiding to design new phosphors for LED and FEDs and novel nanocaged mutifunctional materials.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 96%

Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

et al. 2017

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“…Physical property measurements coupled with a Drude effect in the optical absorption spectra confirms that S12A7 exhibits similar conductivity mode changes associated with the metal to insulator transition (MIT) of C12A7 [74]. Further studies of layered C12A7/S12A7 thin films found an increase in carrier mobility possibly associated with accumulation of charge carriers at the interface between the two films [85]. Bertoni and induced electride formation through the H − replacement reduction process [54].…”

Section: Cationic Doping Of [ ] : ( * ) ( − )mentioning

confidence: 69%

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

Salasin

Rawn

2017

Crystals

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replaced with electrons, and compliments previous structural and electronic property reviews to illuminate the structure-property relationships. Electride formation is updated with new findings in carbonaceous reduction methods. Most importantly, an extensive compilation of cationic doped C12A7 isostructural compounds is presented as motivation to study doped C12A7 electrides. Cationic dopants have profound impacts on the electronic properties due to changes in the density of states, localized electron behavior, and structural distortions.

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“…The value of T c varies in the range 0.14-0.4 K with the concentration of anionic electrons (Ne). [16][17][18][19][20][21] The highest phonon energy of C12A7 is about 787 cm −1 , which is lower than that of LiNbO 3 (880 cm −1 ). 22 It suggests that C12A7 may be more suitable for realizing upconversion luminescence.…”

Section: Introductionmentioning

confidence: 91%

Upconversion luminescence properties and color tunability of 12CaO⋅7Al₂O₃:Ho3+/Yb3+ single crystal

Qiu

Wang

et al. 2016

Mod. Phys. Lett. B

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Rear earth (RE) ions-doped 12CaO · 7Al 2 O 3 single crystal has been successfully prepared by Czochralski method. Under 980 nm excitation, a strong green upconversion emission at 548 nm and a weaker red upconversion emission at 662 nm were observed. The green upconversion emission is corresponding to the transition of 5 F 4 / 5 S 2 → 5 I 8 of Ho 3+ , and the red one is corresponding to the transition of 5 F 5 → 5 I 8 of Ho 3+ . A much weaker NIR band at 762 nm is also observed, which corresponds to the 5 F 4 / 5 S 2 → 5 I 7 transition of Ho 3+ . The pump dependence and luminescence decay dynamics spectra show the green and red upconversion are populated by two-photon process, and the upconversion mechanisms are analyzed in detail. The color of the upconversion luminescence can be changed by simply adjusting the excitation power. RE ions-doped 12CaO · 7Al 2 O 3 single crystal with these properties is expected to have broad application prospects in solidstate multicolor display and instrument integration. RE ions-doped 12CaO · 7Al 2 O 3 single crystal has the ability to replace some traditional single crystals such as LiNbO 3 in many applications.

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Fabrication and electron transport properties of epitaxial films of electron-doped 12CaO·7Al2O3 and 12SrO·7Al2O3

Cited by 20 publications

References 28 publications

Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

Upconversion luminescence properties and color tunability of 12CaO⋅7Al₂O₃:Ho3+/Yb3+ single crystal

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Fabrication and electron transport properties of epitaxial films of electron-doped 12CaO·7Al2O3 and 12SrO·7Al2O3

Cited by 20 publications

References 28 publications

Light‐induced electrons suppressed by Eu3+ ions doped in Ca11.94−xSrxAl14O33 caged phosphors for LED and FEDs

Light‐induced electrons suppressed by Eu3+ ions doped in Ca11.94−xSrxAl14O33 caged phosphors for LED and FEDs

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

Upconversion luminescence properties and color tunability of 12CaO⋅7Al2O3:Ho3+/Yb3+ single crystal

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Product

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Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

Light‐induced electrons suppressed by Eu³⁺ ions doped in Ca_11.94−xSr_xAl₁₄O₃₃ caged phosphors for LED and FEDs

Upconversion luminescence properties and color tunability of 12CaO⋅7Al₂O₃:Ho3+/Yb3+ single crystal