References

Prof. Yuhua Wang

School of Physical Science and Technology

Lanzhou University,

Lanzhou 730000, P.R. China

E-mail address:

Tel.: +86-931-8912772 (Office)

Fax.: +86-931-8913554 (Office)

Email: wyh@lzu.edu.cn

Prof. Weifeng Zhang,

School of Physics and electronics

Henan University,

Kaifeng 475004, P.R. China

Tel.: +86-371-22881940

Fax: +86-371-22880659

E-mail: wfzhang@henu.edu.cn

  Personal Details

Educational Background and Work Experience

Research experiences highlight

1. Preparation and processing of ceramics, powders and films by solid state reaction, sol-gel, hydrothermal, electrospinning, spin-coating etc;

2. Characterization of samples with various techniques including XRD, UV-VIS-NIR fluorescence spectrophotometer, TG/DSC, SEM, TEM, AFM, XPS, ICP, Raman Scattering, etc; Rietveld refinement of crystal structures; density functional theory calculations using VASP and MS software;

3. Analysis of the luminescence properties dependent on the crystal structures including down-shifted luminescence, upconversion luminescence, long-lasting phosphorescence and quantum cutting, etc.

  Summary of my research works

My research work mainly concerns the synthesis, structural characterization, photoluminescence properties study of oxides-based luminescence materials. The major goals of my research include: (i) Understanding the effect of the defects, crystalline size and electronic structure on the photoluminescence properties; (ii) Understanding the excited wavelength ranging from high energy vacuum ultraviolet light to near-infrared  light dependent photoluminescence properties; (iii) Designing novel oxides-based luminescence materials on the basis of knowing the crystal and electronic structure etc., and understanding the valence stability of rare earth ions, the thermal stability, the mechanism of energy transfer etc.. The steps of the work are listed below:

1. Researches from 2009-2013

At this period, my research work aims to assign the host absorption and charge transfer bands and the location of high energy states of Tb³⁺ according to the theory of Dorenbos, Resfeld et.al and using high energy vacuum ultraviolet light at Beamline 4B8 in Beijing Synchrotron Radiation Facilities (BSRF) underdedicated synchrotron mode(2.5GeV,150–160mA). Based on the results, the energy diagram of Tb³⁺ in Ca₉Ln(PO4)₇ (Ln=Y³⁺, La³⁺, Gd³⁺) is given and the detail energy transfer process including visible light quantum cutting and cross relaxation dependent Ln ions is discussed .

2. Researches from 2014-present

Recently, I focus on understanding the photocatalytic activity of the special crystal facet. The major goals include: (i) The order of the photocatalytic activity of NaNbO₃ (100), (110) and (111) crystal planes was identified. (ii) The effect of the substrates on the photocatalytic activity. For example, SrTiO₃ and LaAlO₃ substrate for the photocatalytic activity of SrTiO₃ thin film. (iii) Investigation of anisotropy in photocatalytic activity of ZnO. ZnO (110) exhibits the highest activity among three-low indexed crystal planes. And the ZnO (001) on c-face sapphire had the higher activity due to the higher surface energy and surface conductance.

  Publications

2015年

1. Feng Zhang*, Guoqiang Li, Weifeng Zhang, and Yu Li Yan*, Phase-Dependent Enhancement of the Green-Emitting Upconversion Fluorescence in LaVO₄:Yb³⁺, Er³⁺, Inorg. Chem. 2015, 54, 7325−7334;译

2. Feng Zhang*, Ting Zhang, Guoqiang Li, Weifeng Zhang, Single phase M⁺ (M = Li, Na, K), Dy³⁺ co-doped KSrBP₂O₈ white light emitting phosphors, J. Alloys Compd. 618 (2015) 484–487;

3. Feng Zhang*, Guoqiang Li, Yan Huang, Ye Tao, Excitation wavelength dependent luminescence properties for Eu³⁺-activated Ba₂Gd₂Si₄O₁₃ phosphor, J. Mater. Sci. (2015) 50:4772–4778;

4. Feng Zhang, Zhou Wu, Bingyang Sun, Guoqiang Li*, and Weifeng Zhang, Effect of post-treatment on photocatalytic oxidation activity of (111) oriented NaNbO₃ film, APL Materials (2015) 3:104501;

5. Z.Y.Zhang, M.S.Si, S.L.Peng, Feng Zhang, Y. H. Wang, D.S.Xue, Bandgap engineering in van der Waals heterostructures of blue phosphorene and MoS₂: A first principles calculation, J. Solid State Chem. (2015) 231:64–69;

6. Jianbin Xu, Feng Zhang, Bingyang Sun, Yingge Du, Guoqiang Li*, Weifeng Zhang*, Enhanced Photocatalytic Property of Cu Doped Sodium Niobate, Int. J. Photoenergy, (2015) 846121;

7. Yali Wang, Feng Zhang, Ling Wei, Guoqiang Li*, Weifeng Zhang*, Facet-dependent photocatalytic performance of NiO oriented thin films prepared by pulsed laser deposition, Physica B (2015) 1:457-460.

2014年

8. Feng Zhang*, Weifeng Zhang, Guoqiang Li, Yachun Wang and Hua Yuan, Fluorescence properties of full-color-emitting BCNO phosphors synthesized under different oxygen pressure, Funct. Mater. Lett. (2014) 7(5):1450053;译

9. Feng Zhang*, Weifeng Zhang, Zhiya Zhang, Yan Huang, Ye Tao，Luminescent characteristics and energy transfer of a red-emitting YVO₄:Sm³⁺, Eu³⁺ phosphor, J. Lumin. (2014) 152:160–164;译

10. Zhou Wu, Guoqiang Li*, Feng Zhang, Weifeng Zhang*, Photocatalytic activity of NaTaO₃:La prepared under different atmospheres, Appl. Surf. Sci. (2014) 319:372-375;

11. Haining Cao, Zhiya Zhang, Mingsu Si, Feng Zhang, Yuhua Wang, Indirect-direct band gap transition by van der Waals interaction engineering in MoS₂/WS₂ bilayer heterojunction, Appl. Mech. Mater. (2014) 614:70-74;

12. Fenghua Li, Yuhua Wang, Shuangyu Xin, Feng Zhang and Jia Zhang, Photoluminescence of Nanosized GdAl₃(BO3)₄:Sm³⁺, Eu³⁺ Phosphor Under UV Excitation, J. Nanosci. Nanotechno., (2014) 14(5): 3440-3445.

2013年

13. Feng Zhang*, Y. Wang and Y. Tao, Investigation of the luminescence properties of Tb³⁺-doped Li₆Y (BO₃)₃ phosphors in VUV-VIS range, J. Lumin. (2013) 136:51-56;译

14. Feng Zhang*, Y. Wang and Y. Tao, VUV spectroscopic properties of Ba₂Gd₂Si₄O₁₃:Re³⁺ (Re³⁺=Ce³⁺, Tb³⁺, Dy³⁺, Eu³⁺, Sm³⁺), Mater. Res. Bull. (2013) 48:1952-1956;

15. Feng Zhang*, Y. Wang, Y. Huang, and Y. Tao, Vacuum ultraviolet excited luminescence properties of Ca₃Gd₇(SiO₄)₅(PO₄)O₂:Re³⁺ (Re³⁺=Tb³⁺, Dy³⁺) phosphors, J. Phys. Chem. Solids, (2013) 74:1499-1503;

16. S. F. Zou, Z. L. Zhang, Feng Zhang, Y. L. Mao*, High efficient quantum cutting in Ce³⁺/Yb³⁺co-doped oxyfluoride glasses, J. Alloys Compd. (2013) 572:110-112;

17. Shuangyu Xin, Yuhua Wang*, Ge Zhu, Feng Zhang, Yu Gong, Yan Wen, Bitao Liu, “Tunable white light emitting from mono Ce³⁺ doped Sr₅(PO₄)₂SiO₄ phosphors for light emitting diodes”, Mater. Res. Bull., (2013) 48(4):1627–1631;

2012年

18. Feng Zhang* and Bitao Liu, An intense red-emitting phosphor Ca₃Gd₇(SiO₄)₅(PO₄)O₂:Eu³⁺ for NUV-LEDs application, J. Alloys Compd. (2012) 542:276–279;译

19. Feng Zhang, Yuhua Wang*, and Ye Tao, Photoluminescence Properties of Li₆Gd(BO₃)₃:Tb³⁺ under VUV/UV excitation, Physics Procedia (2012) 29: 55-61;

20. Yuhua Wang*, Feng Zhang, Bitao Liu, Yan Wen, Recent research progress of red Phosphors for PDPs applications, J. Chin. Soc. (2012) 59 (6):689-692;

21. Bitao Liu, Yuhua Wang*, Yan Wen, Feng Zhang, Ge Zhu, and Jia Zhang, Photoluminescence properties of S-doped BaAl₁₂O₁₉:Mn²⁺ phosphors for plasma display panels, Mater. Lett. (2012) 75:137-139;

22. Yan Wen, Yuhua Wang*, Bitao Liu, Feng Zhang, Luminescence properties of Ca₄Y₆(SiO₄)₆O:RE³⁺ (RE = Eu, Tb, Dy, Sm and Tm) under vacuum ultraviolet excitation, Opt. Mater. (2012) 34(5):889-892;

23. Bitao Liu, Yongji Huang, Yan Wen, Luojun Du, Wei Zeng, Yurong Shi, Feng Zhang, Ge Zhu, Xuhui Xu and Yuhua Wang*, Highly dispersive {001} facets-exposed nanocrystalline TiO₂ on high quality graphene as a high performance photocatalyst, J. Mater. Chem., (2012) 22:7484-7491;

24. Yan Wen, Yuhua Wang*, Bitao Liu, Feng Zhang and Yurong Shi, Novel blue-emitting KSrBP₂O₈:Eu²⁺ phosphor for near-UV light-emitting diodes, Funct. Mater. Lett. (2012) 5:1250048.

2011年

25. Feng Zhang, Yuhua Wang*, Jia Zhang, Bitao Liu, Yan Wen and Ye Tao “Photoluminescence Characteristics of Ca₉Ln(PO₄)₇:Tb³⁺ (Ln³⁺=Y³⁺, La³⁺, Gd³⁺) under VUV excitation” Electrochem. Sol. State Lett. (2011)14 (3):J16-J18;

26. Feng Zhang, Yuhua Wang*, Bitao Liu and Yan Wen “Investigation of Na₃GdP₂O₈:Tb³⁺ as a potential green-emitting phosphor for plasma display panels” Mater. Res. Bull. (2011) 46:722-725;

27. Feng Zhang, Yuhua Wang*, and Jidi Liu, “Vacuum ultraviolet spectroscopic properties of KSrPO₄:Tb³⁺” J.Alloys Compd. (2011) 509:3852-3854;

28. Yanqin Li, Yuhua Wang*, Yu Gong, Xuhui Xu and Feng Zhang “Photoionization behavior of Eu²⁺-doped BaMgSiO₄ long-persisting phosphor upon UV irradiation” Acta Mater. (2011) 59:3174-3183;

29. Yan Wen, Yuhua Wang*, Feng Zhang and Bitao Liu, Near-ultraviolet excitable Ca₄Y₆(SiO₄)₆O: Ce³⁺, Tb³⁺ white phosphors for light-emitting diodes, Mater. Chem. Phys., ( 2011) 129:1171-1175；

30. Yan Wen, Yuhua Wang*, Feng Zhang, Bitao Liu, Zhengyan Zhao, Jia Zhang, and Zhigang Yang, Intense Red-Emitting NaYSiO₄: Eu³⁺, Mo⁶⁺ Phosphors for White Light-Emitting Diodes, J. Electrochem. Soc. (2011) 158 (8): J250-J254；

31. Jia Zhang, Yuhua Wang*, Feng Zhang, Yan Huang，Single-phase white-emitting Ca₈MgGd(PO₄)₇:Ln³⁺, Mn²⁺ (Ln³⁺ = Ce³⁺, Tb³⁺ and Dy³⁺) for Mercury-free Lamps, J. Electrochem. Soc. (2011) 158 (4):J110-J114;

32. Zhiya Zhang, Yuhua Wang*, Feng Zhang, Haining Cao, Electronic structures and Eu³⁺ photoluminescence behaviors in Y₂Si₂O₇ and La₂Si₂O₇, J. Alloys Compd. (2011) 509:5023-5027;

2010年

33. Feng Zhang, Yuhua Wang*, Zhiya Zhang, and Bitao Liu, Electronic structure and photoluminescence properties of Eu³⁺-activated KMPO₄ (M=Sr, Ba), J. Mater. Res. (2010) 25:842-849;

34. Feng Zhang, Yuhua Wang*, Yan Wen, Dan Wang, and Ye Tao, Photoluminescence properties of RE³⁺-activated Na₃GdP₂O₈ (RE³⁺ = Tb³⁺, Dy³⁺, Eu³⁺, Sm³⁺) under VUV excitation, Opt. Mater. (2010) 33:475-479;

35. Yanqin Li, Yuhua Wang*, Xuhui Xu, Yu Gong and Feng Zhang, Photoluminescence properties and Valence Stability of Eu in CaMgSiO₄, J. Electrochem. Soc., (2010) 157(2):J39-J43;

36. Bitao Liu, Yuhua Wang*, Feng Zhang, Yan Wen, Qizheng Dong, and Zhaofeng Wang, Thermal stability and photoluminescence of S-doped BaMgAl₁₀O₁₇:Eu²⁺ phosphors for plasma display panels, Opt. Lett., (2010) 35 (18 ), 3072-3074;

37. Yuhua Wang*, Yan Wen, and Feng Zhang, Novel Dy³⁺-doped Ca₂Gd₈(SiO₄)₆O₂ white light phosphors for Hg-free lamps application, Mater. Res. Bull. (2010) 45:1614-1617;

2009年

38. Feng Zhang, Yuhua Wang* and Yinyan Zuo, Hydrothermal synthesis and vacuum ultraviolet excited photoluminescence properties of (Y, La)VO₄:Eu³⁺ phosphors, J. Phys: Conference Series (2009) 152:012052;

39. Feng Zhang and Yuhua Wang*, Photoluminescence Properties of La³⁺, Eu³⁺ Co-Doped YVO₄ Nanocrystalline Powders under VUV/UV Excitation, J. Electrochem. Soc. (2009) 156 (9):J258-J262;

40. Bitao Liu, Yuhua Wang*, Jun Zhou, Feng Zhang, and Zhaofeng Wang, The reduction of Eu³⁺ to Eu²⁺ in BaMgAl₁₀O₁₇:Eu and the photoluminescence properties of BaMgAl₁₀O₁₇:Eu²⁺ phosphor, J. App. Phys. (2009) 106:053102.