A series of Li1-xZn0.9-xPO4:Mn0.1, Alx phosphors are prepared by the solid-state method to obtain a new green-yellow phosphor that can be applied for the light emitting diodes (LED). XRD results confirm that the samples contain LiZnPO4 phase of crystals. Photoluminescence properties of the samples are characterized with photoluminescence of excitation (PLE) and emission spectra (PL), and the effect of Al3+ doping on the PL and PLE properties of Li1-xZn0.9-xPO4:Mn0.1, Alx phosphors is discussed. The results indicate that the dependent curve of relative intensity for PLE and PL on Al3+ doping concentration is a parabola curve with mouth downward and maximum value, and the optimal molar concentration of Al3+ for the samples is 3%,with corresponding sample being Li0.97Zn0.87PO4:Mn0.1, Al0.03. The research results indicate that the peak area of emission bands of Li1-xZn0.9-xPO4:Mn0.1, Alx with the optimal x is 3.98 times of that of sample with x=0. The fact suggests that the Al3+ ions can enhance the emission of Mn2+. Furthermore, Al3+ doping only affects the intensity of Mn2+ emission, and cannot influence its mode. The value for chromaticity coordinate of Li0.97Zn0.87 PO4:Mn0.1, Al0.03 indicates that it is a green-yellow emitting phosphor, which can be potentially useful as a UV excited phosphor for LEDs.
NONG Rong
,
HUANG Yingheng
,
LU Ke
,
LIAO Sen
,
TAN Hongyu
. Synthesis and Al3+ sensitized luminescence of green-yellow emitting phosphor LiZnPO4:Mn2+, Al3+ for LED[J]. Science & Technology Review, 2015
, 33(13)
: 13
-16
.
DOI: 10.3981/j.issn.1000-7857.2015.13.001
[1] Vasovic D D, Stojakovic D R. Metal phosphate preparation using boron phosphate[J]. Materials Research Bulletin, 1997, 32(6): 779-784.
[2] Chen J, Natarajan S, Thomas J, et al. A novel openframework cobalt phosphate containing a tetrahedrally coordinated cobalt(II) center: CoPO4 ·0.5C2H10N2[J]. Angewandte Chemie International Edition, 1994, 33(6): 639-640.
[3] Gier T E, Stucky G D. Low-temperature synthesis of hydrated zinco (beryllo)- phosphate and arsenate molecular sieves[J]. Nature, 1991, 349: 508-510.
[4] Ng H Y, Harrison W T A. Monoclinic NaZnPO4-ABW, a new modification of the zeolite ABW structure type containing elliptical eight-ring channels[J]. Microporous and Mesoporous Materials, 1998, 23(3- 4): 197-202.
[5] Harrison W T A, Gier T E, Nicol J M, et al. Tetrahedral-framework lithium zinc phosphate phases: Location of light- atom positions in LiZnPO4·H2O by powder neutron diffraction and structure determination of LiZnPO4 by ab initio methods[J]. Journal of Solid State Chemistry, 1995, 114(1): 249-257.
[6] Jensen T R. A new polymorph of LiZnPO4 · H2O: synthesis, crystal structure and thermal transformation[J]. Journal of the Chemical Society, Dalton Transactions, 1998, 18(13): 2261-2266.
[7] Bu X H, Gier T E, Stucky G D. A new polymorph of lithium zinc phosphate with the cristobalite-type framework topology[J]. Journal of Solid State Chemistry, 1998, 138(1): 126-130.
[8] Bensalem A. Synthesis and characterization of a new layered lithium zinc phosphate hydrate[J]. Journal of Solid State Chemistry, 2001, 162 (1): 29-33.
[9] Jensen T R, Hazell R G, Nørlund Christensen A, et al. Hydrothermal synthesis of lithium zinc phosphates: Structural investigation of twinned β- Li4Zn(PO4)2 and a high temperature polymorph α - Li4Zn(PO4)2[J]. Journal of Solid State Chemistry, 2002, 166(2): 341-351.
[10] Chan T S, Liu R S, Baginskiy I. Synthesis, crystal structure, and luminescence properties of a novel green- yellow emitting phosphor LiZn1 - xPO4:Mnx for light emitting diodes[J]. Chemistry of Materials, 2008, 20(4): 1215-1217.
[11] Chai Q, Chen Z P, Liao S, et al. Preparation of LiZn0.9PO4:Mn0.1 ·H2O via a simple and novel method and its non-isothermal kinetics using iso-conversional calculation procedure[J]. Thermochimica Acta, 2012, 533(1-2): 74-80.
[12] Zhang S Y, Huang Y L, Seo H J. The spectroscopic properties and structural occupation of Eu3+ sites in LiMgPO4 phosphor[J]. Journal of the Electrochemical Society, 2010, 157(5): 186-190.
[13] Peng Y M, Su Y K, Yang R Y. The charge transfer transition phenomenon and microstructure of Eu3+-doped NaCaPO4 phosphors sintered with NH4Cl flux via solid-state reaction[J]. Materials Research Bulletin, 2013, 48(5): 1946-1951.
[14] Liang Z J, Mo F W, Zhang X G, et al. Optical properties and energy transfer of NaCaPO4:Tb3+ , Eu3+ phosphors[J]. Ceramics International, 2014, 40(5): 7501-7506
[15] Chen L, Zhang Z H, Tong C, et al. Improved photoluminescence of red-emitting NaCaPO4:Eu3+ phosphor by charge compensation[J]. Physical Status Solidi A, 2012, 209(7): 1313-1316.
[16] Yang R Y, Peng Y M, Su Y K. Novel red- emitting microwaveassisted- sintered LiSrPO4: Eu3+ phosphors for application in near-uv white light-emitting diodes[J]. Journal of Electronic Materials, 2013, 42(10): 2910-2914.
[17] Zhang S Y, Nakai Y, Tsuboi T, et al. Luminescence and microstructural features of eu-activated LiBaPO4 phosphor [J]. Chemistry of Materials, 2011, 23(5): 1216-1224.
[18] Zhang S Y, Wei D L, Zhu R, et al. The luminescence and structural characteristics of Eu3+-doped NaBaPO4 phosphor[J]. Ceramics International, 2011, 37(8): 3697-3702.
[19] Li X, Guan L, Li X N, et al. Luminescent properties of NaBaPO4:Eu3+ red-emitting phosphor for white light-emitting diodes[J]. Powder Technology, 2010, 200(1-2): 12-15.
[20] Wang Z J, Li P L, Yang Z P, et al. Spectral characteristics of KBaPO4Eu3+red emitting phosphor[J]. Acta Photonica Sinica, 2011, 40 (3): 336-339.
[21] Shinde K N, Pawade V B, Dhoble S J, et al. Orange emission in Eu3+- activated Mg2M (PO4)2(M=Sr and KNa) and KSrPO4 phosphors[J]. Chemistry Synthesis and Reactivity in Inorganic and Metal- Organic Chemistry, 2011, 41(3-5): 517-524.
[22] Mu Z F, Hu Y H, Chen L, et al. Enhanced red emission in Sr2CeO4: Eu3+ by charge compensation[J]. Journal of the Electrochemical Society, 2011, 158(10): 287-290.
[23] Luo H D, Liu J, Zheng X, et al. Enhanced photoluminescence of Sr3SiO5:Ce3+ and tuneable yellow emission of Sr3SiO5:Ce3+, Eu2+ by Al3+ charge compensation for W-LEDs[J]. Journal of Materials Chemistry, 2012, 22(1): 15887-15893.
[24] Nolan M. Charge compensation and Ce3+ formation in trivalent doping of the CeO2(110) surface: The key role of dopant ionic radius[J]. Journal of Physical Chemistry C, 2011, 115(14): 6671-6681.
[25] Chan T S, Liu R S, Baginskiy I. Synthesis, crystal structure, and luminescence properties of a novel green- yellow emitting phosphor LiZn1-xMnxPO4:Mnx for light emitting diodes[J]. Chemistry of Materials, 2008, 20(4): 1215-1217.
[26] Su F, Ma B, Ding K, et al. Luminescence temperature and pressure studies of Zn2SiO4 phosphors doped with Mn2+ and Eu3+ ions[J]. Journal of Luminescence, 2006, 116(1-2) 117-126.
