J. Semicond. > 2015, Volume 36?>?Issue 12?> 123008

SEMICONDUCTOR MATERIALS

Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting

Donghua Cao, Hui Wang, Hongjun Wei and Weiqiang Yang

+ Author Affiliations

 Corresponding author: Wang Hui,Email:15613925832@163.com

DOI: 10.1088/1674-4926/36/12/123008

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Abstract: The green-emitting phosphor BaSi2O5:Eu2+ was synthesized by the conventional solid state reaction. Using the CASTEP code, BaSi2O5 is calculated to be an intermediate band gap semiconductor with an indirect energy gap of about 3. 2 eV. As expected, the calculated optical band gap of BaSi2O5 is lower compared to the experimentally determined values. Eu2+-activated BaSi2O5 phosphor can be excited efficiently over a broad spectral range between 200 and 400 nm, and has an emission peak at 500 nm with a full width at half maximum of 95 nm. The study of concentration-dependent emission intensity shows the optimal concentration of the Eu2+ is 0.05 mol, and that concentration quenching occurs when the Eu2+ content is beyond the critical value. The external quantum efficiency of the optimized BaSi2O5:Eu2+ is 96. 1%, 70. 2% and 62. 1% under excitation at 315, 350 and 365 nm, respectively. The superior optical properties of the sample show the potential as an ultraviolet converting green-emitting phosphor for white light emitting diodes.

Key words: light emitting diode, the green-emitting phosphor BaSi2O5, Eu2+



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Fig. 1.  Band structure of host lattice BaSi2O5.

Fig. 2.  Diffuse reflection spectrum of the host lattice BaSi2O5. The inset shows the absorption spectrum as calculated by the Kubelka- Munk function.

Fig. 3.  (Color online) Total and partial density of states of

Fig. 4.  XRD profile for BaSi2O5:0.05Eu2+ phosphor.

Fig. 5.  Excitation and emission spectra for BaSi2O5:0.05Eu2+.

Fig. 6.  (Color online) Emission spectra of BaSi2O5:Eu2+ at different Eu2+ concentrations.

Fig. 7.  Plot of lg(xEu2+) versus lg(I/xEu2+) in the BaSi2O5:xEu2+ samples (λex=365 nm).

Fig. 8.  (Color online) CIE chromaticity diagram for the composition-optimal BaSi2O5:0.05Eu2+ phosphor.

Table 1.   Crystal lattice constants for BaSi2O5 crystal.

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    Received: 26 March 2015 Revised: Online: Published: 01 December 2015

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      Donghua Cao, Hui Wang, Hongjun Wei, Weiqiang Yang. Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting[J]. Journal of Semiconductors, 2015, 36(12): 123008. doi: 10.1088/1674-4926/36/12/123008 ****D H Cao, H Wang, H J Wei, W Q Yang. Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting[J]. J. Semicond., 2015, 36(12): 123008. doi: 10.1088/1674-4926/36/12/123008.
      Citation:
      Donghua Cao, Hui Wang, Hongjun Wei, Weiqiang Yang. Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting[J]. Journal of Semiconductors, 2015, 36(12): 123008. doi: 10.1088/1674-4926/36/12/123008 ****
      D H Cao, H Wang, H J Wei, W Q Yang. Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting[J]. J. Semicond., 2015, 36(12): 123008. doi: 10.1088/1674-4926/36/12/123008.

      Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting

      DOI: 10.1088/1674-4926/36/12/123008

      • Jingao Solar Holdings Co., Ltd, Ningjin 055550, China

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      • Corresponding author: Wang Hui,Email:15613925832@163.com
      • Received Date: 2015-03-26
      • Accepted Date: 2015-06-23
      • Published Date: 2015-01-25

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