Skip to main content
placeholder image

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Journal Article


Abstract


  • Narrow-band green-emitting phosphor β-SiAlON:Eu has been widely used in advanced wide-gamut backlighting devices. However, the origins for unusual sharp lines in photoluminescence emission at room temperature and tunable narrow-band-emission tailored by reducing Al-O in β-SiAlON:Eu are still unclear. Here, the presence of sharp-line fine structure in the emission spectra of β-SiAlON:Eu is mainly due to purely electronic transitions (zero phonon lines), and their vibronic repetitions resulting from the multimicroenvironment around Eu 2+ ions that has been revealed by relative emission intensity of sharp line depends on excitation wavelength and monotonously increasing decay time. The specific features of the Eu 2+ occupying interstitial sites indicate that the effect of crystal field strength can be neglected. Therefore, the enhanced rigidity and higher ordering structure of β-SiAlON:Eu with decreasing the substitution of Si-N by Al-O become the main factors in decreasing electron-lattice coupling and reducing inhomogeneous broadening, favoring the blue-shift and narrow of the emission band, the enhanced thermal stability, as well as the charge state of Eu 2+ . Our results provide new insights for explaining the reason for narrow-band-emission in β-SiAlON:Eu, which will deliver an impetus for the exploration of phosphors with narrow band and ordering structure.

UOW Authors


  •   Zhang, Xuejie (external author)
  •   Fang, Muhuai (external author)
  •   Tsai, Yi-Ting (external author)
  •   Lazarowska, Agata (external author)
  •   Mahlik, Sebastian (external author)
  •   Lesniewski, Tadeusz (external author)
  •   Grinberg, Marek (external author)
  •   Pang, Wei Kong
  •   Pan, Fengjuan (external author)
  •   Liang, Chaolun (external author)
  •   Zhou, Wuzong (external author)
  •   Wang, Jing (external author)
  •   Lee, Jyhfu (external author)
  •   Cheng, Bing (external author)
  •   Hung, Tsu (external author)
  •   Chen, Yang-Yuan (external author)
  •   Liu, Ru-Shi (external author)

Publication Date


  • 2017

Citation


  • Zhang, X., Fang, M., Tsai, Y., Lazarowska, A., Mahlik, S., Lesniewski, T., Grinberg, M., Pang, W. Kong., Pan, F., Liang, C., Zhou, W., Wang, J., Lee, J., Cheng, B., Hung, T., Chen, Y. & Liu, R. (2017). Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application. Chemistry of Materials, 29 (16), 6781-6792.

Scopus Eid


  • 2-s2.0-85027865540

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2713

Number Of Pages


  • 11

Start Page


  • 6781

End Page


  • 6792

Volume


  • 29

Issue


  • 16

Place Of Publication


  • United States

Abstract


  • Narrow-band green-emitting phosphor β-SiAlON:Eu has been widely used in advanced wide-gamut backlighting devices. However, the origins for unusual sharp lines in photoluminescence emission at room temperature and tunable narrow-band-emission tailored by reducing Al-O in β-SiAlON:Eu are still unclear. Here, the presence of sharp-line fine structure in the emission spectra of β-SiAlON:Eu is mainly due to purely electronic transitions (zero phonon lines), and their vibronic repetitions resulting from the multimicroenvironment around Eu 2+ ions that has been revealed by relative emission intensity of sharp line depends on excitation wavelength and monotonously increasing decay time. The specific features of the Eu 2+ occupying interstitial sites indicate that the effect of crystal field strength can be neglected. Therefore, the enhanced rigidity and higher ordering structure of β-SiAlON:Eu with decreasing the substitution of Si-N by Al-O become the main factors in decreasing electron-lattice coupling and reducing inhomogeneous broadening, favoring the blue-shift and narrow of the emission band, the enhanced thermal stability, as well as the charge state of Eu 2+ . Our results provide new insights for explaining the reason for narrow-band-emission in β-SiAlON:Eu, which will deliver an impetus for the exploration of phosphors with narrow band and ordering structure.

UOW Authors


  •   Zhang, Xuejie (external author)
  •   Fang, Muhuai (external author)
  •   Tsai, Yi-Ting (external author)
  •   Lazarowska, Agata (external author)
  •   Mahlik, Sebastian (external author)
  •   Lesniewski, Tadeusz (external author)
  •   Grinberg, Marek (external author)
  •   Pang, Wei Kong
  •   Pan, Fengjuan (external author)
  •   Liang, Chaolun (external author)
  •   Zhou, Wuzong (external author)
  •   Wang, Jing (external author)
  •   Lee, Jyhfu (external author)
  •   Cheng, Bing (external author)
  •   Hung, Tsu (external author)
  •   Chen, Yang-Yuan (external author)
  •   Liu, Ru-Shi (external author)

Publication Date


  • 2017

Citation


  • Zhang, X., Fang, M., Tsai, Y., Lazarowska, A., Mahlik, S., Lesniewski, T., Grinberg, M., Pang, W. Kong., Pan, F., Liang, C., Zhou, W., Wang, J., Lee, J., Cheng, B., Hung, T., Chen, Y. & Liu, R. (2017). Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application. Chemistry of Materials, 29 (16), 6781-6792.

Scopus Eid


  • 2-s2.0-85027865540

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2713

Number Of Pages


  • 11

Start Page


  • 6781

End Page


  • 6792

Volume


  • 29

Issue


  • 16

Place Of Publication


  • United States