Photoluminescence characteristics and energy transfer between Bi3+ and Eu3+ in Gd2O3: Eu3+, Bi3+ nanophosphors

Wei, Xiantao; Chen, Y. H; Cheng, Xuerui; Yin, Min; Xu, Wenbin

doi:10.1007/s00340-010-3971-4

Cited by 39 publications

(22 citation statements)

References 12 publications

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“…3 P 2 transitions are strongly forbidden by the electronic selection rules for the cubic groups, the Bi 3? transitions between the 1 S 0 ground state and the 3 P 1 or 1 P 1 excited states are usually observed [9,35,36]. Wei et al [9] ascribed the absorption band of Bi 3?…”

Section: Xrd and Dta-tg Analysesmentioning

confidence: 98%

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Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Abo-Naf

Abdel-Hameed

Marzouk

et al. 2015

J Mater Sci: Mater Electron

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Multifunctional phosphors possessing paramagnetic and semiconducting properties have been synthesized by the sol-gel method. These phosphors are composed of Gd-doped and Bi-Gd-codoped hybrid ethylene glycol (EG)-modified silica glasses. The chemical composition of these hybrids is constituted from 1.5:1 molar ratio of EG:silica, doped with 3 mol% of Gd 2 O 3 in case of the Gd-doped hybrid and with 3 mol% of both of the Bi 2 O 3 and Gd 2 O 3 in case of the Bi-Gd-codoped hybrid. The synthesized hybrid glasses, in the form of transparent and crack-free bulk samples, were analyzed with powder X-ray diffraction, differential thermal analysis coupled with thermogravimetry, vibrating sample magnetometer (VSM), Fourier transform infrared and ultraviolet-visible spectroscopy. Paramagnetic behavior of the glasses was confirmed with VSM results. Absorption properties of the Gd-doped glass in the UV region have three characteristic peaks at 240, 276 and 352 nm. Introduction of bismuth produces additional band at 423 nm in the visible region. Photoluminescence of the glasses was investigated by excitation and emission spectroscopy. Interestingly, excited states other than f-f states are emphasized. Upon UV light excitation at 204 and 274 nm, the Gd-doped glass exhibits phosphorescence visible triplet; blue, green and red; emissions. Under UV light excitation at 304 nm, only blue emission was obtained. These emissions originate from the low-energy intraligand (IL) emissions induced by the Gd 3? in the EG ligand due to the heavy-atom effect and paramagnetism of Gd 3? ions. Incorporation of Bi 3? increases the intensity of Gd-EG-IL emissions and, thus, controls over the luminescence intensity of blue, green and red emissions to achieve white overall emission.

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Section: Xrd and Dta-tg Analysesmentioning

confidence: 98%

“…ions can convert UV photons absorbed by Bi 3? ions into red emission at 611 nm in Gd 2 O 3 nanocrystals [9]. This is favorable for high efficient and high rendering lamps.…”

Section: Introductionmentioning

confidence: 98%

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Abo-Naf

Abdel-Hameed

Marzouk

et al. 2015

J Mater Sci: Mater Electron

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“…The larger the concentration of Bi 3+ ions, the shorter the distance between the Bi 3+ ions is, the farther the distraction of the energy transfer along the Bi 3+ ions will be, resulting in greater probability of transferring energy from Bi 3+ ions to the quenching centres. So, there will be less energy transfer from Bi 3+ ions to Eu 3+ ions and the emission intensity decreases [17]. Figure 10a shows the variation of PL intensity under 230 and 350 nm excitation as a function of Bi 3+ concentration.…”

Section: Resultsmentioning

confidence: 96%

“…Low-temperature chemical methods have been proven to be very useful means for determining the properties of a variety of functional nanomaterials over the last few decades [13][14][15][16][17]. As a part of our programme on nanophosphors, here we report the tunable luminescent properties of Gd 2 O 3 :Eu 3+ co-doped with Bi 3+ ions prepared by a lowtemperature solution combustion method.…”

Section: Introductionmentioning

confidence: 98%

Synthesis, characterization, thermo- and photoluminescence properties of Bi3+ co-doped Gd2O3:Eu3+ nanophosphors

Dhananjaya

Nagabhushana

et al. 2012

Appl. Phys. B

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Gd 2 O 3 :Eu 3+ (4 mol%) co-doped with Bi 3+ (Bi = 0, 1, 3, 5, 7, 9 and 11 mol%) ions were synthesized by a low-temperature solution combustion method. The powders were calcined at 800°C and were characterized by powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), Fourier transform infrared and UV-Vis spectroscopy. The PXRD profiles confirm that the calcined products were in monoclinic with little cubic phases. The particle sizes were estimated using Scherrer's method and Williamson-Hall plots and are found to be in the ranges 40-60 nm and 30-80 nm, respectively. The results are in good agreement with TEM results. The photoluminescence spectra of the synthesized phosphors excited with 230 nm show emission peaks at ∼590, 612 and 625 nm, which are due to the transitions 5 D 0 → 7 F 0 , 5 D 0 → 7 F 2 and 5 D 0 → 7 F 3 of Eu 3+ , respectively. It is observed that a significant quenching of Eu 3+ emission was observed under 230 nm excitation when Bi 3+ was co-doped. On the other hand, upon 350 nm excitation, the luminescent intensity of Eu 3+ ions was enhanced by incorporation of Bi 3+ (5 mol%) ions. The introduction of Bi 3+ ions broadened the excitation band of Eu 3+ of which a new strong band occurred ranging from 320 to 380 nm. This has been attributed to the 6s 2 → 6s6p transition of Bi 3+ ions, implying a very efficient energy transfer from Bi 3+ ions to Eu 3+ ions. The gamma radiation response of Gd 2 O 3 :Eu 3+ exhibited a dosimetrically useful glow peak at 380°C. Using thermoluminescence glow peaks, the trap parameters have been evaluated and discussed. The observed emission characteristics and energy transfer indicate that Gd 2 O 3 :Eu 3+ , Bi 3+ phosphors have promising applications in solid-state lighting.

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“…Bi 3+ co-doping has been developed as a valuable approach to enhance the luminescence of RE ions [9][10][11][12][13][14][15][16][17][18][19][20][21]. There are about three type of enhancement effect of Bi 3+ on RE ions luminescence.…”

Section: Introductionmentioning

confidence: 99%

White luminescence and energy transfer process in Bi3+,Sm3+ co-doped Ca3Al2O6 phosphors

et al. 2015

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Photoluminescence characteristics and energy transfer between Bi3+ and Eu3+ in Gd2O3: Eu3+, Bi3+ nanophosphors

Cited by 39 publications

References 12 publications

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Synthesis, characterization, thermo- and photoluminescence properties of Bi3+ co-doped Gd2O3:Eu3+ nanophosphors

White luminescence and energy transfer process in Bi3+,Sm3+ co-doped Ca3Al2O6 phosphors

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