Abstract
A series of red-emitting phosphors with compositions of La2(Mo1−zSiz)2O9:0.05Eu3+ (0 ≤ z ≤ 0.10) with strong near-UV absorption were prepared by solid-state method. The structure and luminescence properties were investigated by x-ray powder diffraction, UV–vis diffuse reflectivity, and photoluminescence spectra. The luminescent properties as a function of Si4+ concentrations were systematically studied. Under excitation of a wide range near-UV (250–430 nm) or blue light, Si4+-doped series phosphors exhibit characteristic red emission of Eu3+ peaked at 615 nm. The incorporation of Si4+ into La2Mo2O9:0.05Eu3+ phosphor leads to the improvement of the excitation broad band and sharp peaks, as well as the broadening of charge transfer band. Appropriate amount of Si4+ doping can enhance the red luminescence intensity. Finally, the possible reasons for the luminescence enhancement via the corporation of Si4+ were explained.
Similar content being viewed by others
References
E.F. Schubert and J.K. Kim: Solid-state light sources getting smart. Science 308, 1274 (2005).
H.A. Höppe: Recent developments in the field of inorganic phosphors. Angew. Chem. Int. Ed. 48, 3572 (2009).
A.A. Setlur: Phosphors for LED-based solid-state lighting. Electrochem. Soc. Interface 18, 32 (2009).
J.M. Phillips, M.E. Coltrin, M.H. Crawford, A.J. Fischer, M.R. Krames, R.M. Mach, G.O. Mueller, Y. Ohno, L.E.S Rohwer, J.A. Simmons, and J.Y. Tsao: Research challenges to ultra-efficient inorganic solid-state lighting. Laser & Photon Rev. 1, 307 (2007).
T. Hashimoto, F. Wu, J.S. Speck, and S. Nakamura: A GaN bulk crystal with improved structural quality grown by the ammonothermal method. Nat. Mater. 6, 568 (2007).
S. Neeraj, N. Kijima, and A.K. Cheetham: Novel red phosphors for solid-state lighting: The system NaM(WO4)2−x(MoO4)x:Eu3+ (M=Gd, Y, Bi). Chem. Phys. Lett. 387, 2 (2004).
S. Neeraj, N. Kijima, and A.K. Cheetham: Novel red phosphors for solid state lighting; the system BixLn1-xVO4; Eu3+/Sm3+ (Ln = Y, Gd). Solid State Commun. 131, 65 (2004).
M. Nyman, M.A. Rodriguez, L.E. Shea-Rohwer, J.E. Martin, and P.P. Provencio: Highly versatile rare earth tantalate pyrochlore nanophosphors. J. Am. Chem. Soc. 131, 11652 (2009).
G. Pan, H. Song, Q. Dai, R. Qin, X. Bai, B. Dong, L. Fan, and F. Wang: Microstructure and optical properties of Eu3+ activated YV1-xPxO4 phosphors. J. Appl. Phys. 104, 084910 (2008).
F. Wang, X. Xue, and X. Liu: Multicolor tuning of (Ln, P)-doped YVO4 nanoparticles by single-wavelength excitation. Angew. Chem. Int. Ed. 47, 906 (2008).
Z. Ci, Y. Wang, J. Zhang, and Y. Sun: Ca1-xMo1-ySiyO4:Eux3+: A novel red phosphor for white light emitting diodes. Physica B 403, 607 (2008).
A. Xie, X. Yuan, S. Hai, J. Wang, F. Wang, and L. Li: Enhancement emission intensity of CaMoO4:Eu3+, Na+ phosphor via Bi co-doping and Si substitution for application to white LEDs. J. Phys. D: Appl. Phys. 42, 105107 (2009).
P. Lacorre, F. Goutenoire, O. Bohnke, R. Retoux, and Y. Laligant: Designing fast oxide-ion conductors based on La2Mo2O9. Nature 404, 856 (2000).
G. Corbel, Y. Laligant, F. Goutenoire, E. Suard, and P. Lacorre: Effects of partial substitution of Mo6+ by Cr6+ and W6+ on the crystal structure of the fast oxide-ion conductor structural effects of W6+. Chem. Mater. 17, 4678 (2005).
T. Kim and S. Kang: Potential red phosphor for UV-white LED device. J. Lumin. 122–, 964 (2007).
D. Marrero-López, P. Núñez, M. Abril, V. Lavín, U.R. Rodríguez-Mendoza, and V.D. Rodríguez: Synthesis, electrical properties, and optical characterization of Eu3+-doped La2Mo2O9 nanocrystalline phosphors. J. Non-Cryst. Solids 345–, 377 (2004).
X. Li, Z. Yang, L. Guan, C. Liu, and P. Li: Luminescent properties of Eu3+-doped La2Mo2O9 red phosphor by the flux method. J. Cryst. Growth 310, 3117 (2008).
H. Gong, S. Shi, and J. Zhou: Enhanced red luminescence of Eu3+ and R3+ -doped La2Mo2O9 phosphors under blue light excitation. Curr. Appl. Phys. 11, 551 (2011).
M. Nazarov: Luminescence mechanism of highly efficient YAG and TAG phosphors. Moldavian J. Phys. Sci. 4, 347 (2005).
W.E. Hank, P.W. Barnes, M.A. Benjamin, and M.W. Patrick: Investigations of the electronic structure of d0 transition metal oxides belonging to the perovskite family. J. Solid State Chem. 175, 94 (2003).
P. Dai, X. Zhang, X. Li, G. Wang, C. Zhao, and Y. Liu: Red-emitting LiEuMo2-xSixO8 phosphors for white light-emitting diodes. J. Lumin. 131, 653 (2011).
H. Ryu, B.K. Singh, K.S. Bartwal, M.G. Brik, and I.V. Kityk: Novel efficient phosphors on the base of Mg and Zn co-doped SrTiO3:Pr3+. Acta Mater. 56, 358 (2008).
Y. Yu, D. Chen, Y. Wang, P. Huang, F. Weng, and M. Niu: Enhanced photoluminescence of Eu3+ induced by energy transfer from In2O3 nano-crystals embedded in glassy matrix. Phys. Chem. Chem. Phys. 11, 8774 (2009).
W. Wang, C. Jiang, M. Shen, L. Fang, F. Zheng, X. Wu, and J. Shen: Effect of oxygen vacancies on the red emission of SrTiO3:Pr3+ phosphor films. Appl. Phys. Lett. 94, 081904 (2009).
S. Kubota, H. Hara, H. Yamane, and M. Shimada: Luminescence property of Eu3+ in a newly compound, (Sr0.99La1.01)Zn0.99O3.495. J. Electrochem. Soc. 149, H68 (2002).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
He, X., Guan, M., Zhang, C. et al. Luminescence enhancement of Eu3+-activated La2Mo2O9 red-emitting phosphor through chemical substitution. Journal of Materials Research 26, 2379–2383 (2011). https://doi.org/10.1557/jmr.2011.269
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/jmr.2011.269