Investigation of red-emission phosphors (Ca,Sr)(Mo,W)O:Eu3+ crystal structure, luminous characteristics and calculation of Eu3+ 5D0 quantum efficiency

Cao, Fabin; Li, L.S.; Tian, Yue; Chen, Y.J.; Wu, Xingrong

doi:10.1016/j.tsf.2011.05.010

Cited by 41 publications

(19 citation statements)

References 37 publications

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“…Recently, several processes have been developed to increase the applications of rare-earth-doped metal molybdates prepared using a range of processes, including solid-state reactions [10][11][12][13][14], coprecipitation [15], the sol-gel method [16], the hydrothermal method [17][18][19], the Pechini method [20], the solvothermal route [21] and the microwave-assisted hydrothermal method [22]. For practical application of UC photoluminescence in such products as lasers, three-dimensional displays, light emitting devices, and biological detectors, features such as homogeneous UC particle size distribution and morphology need to be well defined.…”

Section: Introductionmentioning

confidence: 99%

Cyclic MAM synthesis and upconversion photoluminescence properties of CaMoO4:Er3+/Yb3+ particles

Lim

2012

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 99%

Cyclic MAM synthesis and upconversion photoluminescence properties of CaMoO4:Er3+/Yb3+ particles

Lim

2012

Materials Research Bulletin

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“…As shown in Fig. 5a, the intraconfigurational 4f 6 excitation lines of Eu 3+ ion are weaker compared with the charge-transfer transition in MoO 4 , which indicates that there exists efficient energy transfer from MoO 4 unit to the Eu 3+ ion, similar with that in molybdates [29][30][31][32]. Fig.…”

Section: Resultsmentioning

confidence: 76%

Eu3+-doped CdMoO4 red phosphor synthesized through an aqueous solution route at room temperature

Wang

Zhen

Shao

et al. 2012

Journal of Alloys and Compounds

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“…As a result, with the help of Eqs (8–11), the quantum efficiency of the Eu 3+ -activated La 2 MoO 6 -La 2 WO 6 red-emitting phosphors with the optimal doping concentration is calculated to be 27.7%. It is evident that the achieved value is comparable with other reported red-emitting phosphors, in which their quantum efficiencies were also estimated by utilizing the above method, such as (Ca,Sr)(Mo,W)O 4 :Eu 3+ (28.6%), Ca 3 Sn 3 Nb 2 O 14 :Eu 3+ (30.29%), La 2 W 1.6 Mo 0.4 O 9 :Eu 3+ (22.38%) and SrNb 2 O 6 :Eu 3+ (17.84%) 56–59 , further implying that the resultant red-emitting phosphors are promising for WLEDs. Additionally, to further understand the optical performance of the resultant phosphors, the quantum efficiency of the La 2 MoO 6 -La 2 WO 6 :0.24Eu 3+ red-emitting phosphors was measured.…”

Section: Resultsmentioning

confidence: 99%

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

2017

Sci Rep

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A series of novel Eu3+ -activated La 2 MoO 6 -La 2 WO 6 red-emitting phosphors have been successfully prepared by a citrate-assisted sol-gel process. Both photoluminescence excitation and emission spectra suggest that the resultant products have the strong ultrabroad absorption band ranging from 220 to 450 nm. Under the excitation of 379 nm, the characteristic emissions of Eu 3+ ions corresponding to the 5 D 0 → 7 F J transitions are observed in the doped samples. The optimal doping concentration for Eu 3+ions is found to be 12 mol% and the quenching mechanism is attributed to the dipole-dipole interaction. A theoretical calculation based on the Judd-Ofelt theory is carried out to explore the local structure environment around the Eu 3+ ions. The studied samples exhibit a typical thermal quenching effect with a T 0.5 value of 338 K and the activation energy is determined to be 0.427 eV. A near-ultraviolet (NUV)-based white light-emitting diode (LED) is packaged by integrating a mixture of resultant phosphors, commercial blue-emitting and green-emitting phosphors into an NUV LED chip. The fabricated LED device emits glaring white light with high color rendering index (84.6) and proper correlated color temperature (6492 K). These results demonstrate that the Eu 3+ -activated La 2 MoO 6 -La 2 WO 6 compounds are a promising candidate for indoor lighting as red-emitting phosphors.By virtue of admirable advantages of long working lifetime, energy saving, low cost, high luminous efficiency and environmental compatibility, the phosphor-converted white light-emitting diodes (WLEDs) which are considered as the next-generation illumination sources to supersede the conventional fluorescent lamps have been extensively used in indoor lighting, automobile displays and flashlights [1][2][3][4][5] . Presently, the commercial WLEDs which are made up of a blue-emitting InGaN LED chip and Y 3 Al 5 O 12 :Ce 3+ yellow-emitting phosphors suffer from poor color rending index (CRI ~ 70-80) and high correlated color temperature (CCT ~ 7000 K) as a result of inefficient red emission component [6][7][8] . To circumvent these drawbacks, a new strategy utilizing the near-ultraviolet (NUV) LED chip to pump the hybrid tricolor (blue, green and red) phosphors is performed to emit warm white light [9][10][11] . From the aforementioned combinations, one knows that the eventual behaviors of WLED devices can be significantly affected by the phosphors and they are expected to be efficiently excited by NUV or blue light. In comparison with commercial blue-emitting and green-emitting phosphors, the current red-emitting phosphors, by taking Y 2 O 2 S:Eu 3+ for example, still exhibit some unsatisfied characteristics such as weak absorption in the NUV/blue region, low luminous efficiency and poor stability 12,13 . In order to improve the performance of red-emitting phosphors, the nitride-and germanide-based red-emitting phosphors, such as Ca 2 Si 5 N 8 :Eu 2+ , Sr[LiAl 3 N 4 ]:Eu

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Investigation of red-emission phosphors (Ca,Sr)(Mo,W)O:Eu3+ crystal structure, luminous characteristics and calculation of Eu3+ 5D0 quantum efficiency

Cited by 41 publications

References 37 publications

Cyclic MAM synthesis and upconversion photoluminescence properties of CaMoO4:Er3+/Yb3+ particles

Cyclic MAM synthesis and upconversion photoluminescence properties of CaMoO4:Er3+/Yb3+ particles

Eu3+-doped CdMoO4 red phosphor synthesized through an aqueous solution route at room temperature

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

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