Jump to main content
Jump to site search

Issue 28, 2017
Previous Article Next Article

Tunable white light of a Ce3+,Tb3+,Mn2+ triply doped Na2Ca3Si2O8 phosphor for high colour-rendering white LED applications: tunable luminescence and energy transfer

Author affiliations

Abstract

A tunable white light emitting Na2Ca3Si2O8:Ce3+,Tb3+,Mn2+ phosphor with a high color rendering index (CRI) has been prepared. Under UV excitation, Na2Ca3Si2O8:Ce3+ phosphors present blue luminescence and exhibit a broad excitation ranging from 250 to 400 nm. When codoping Tb3+/Mn2+ ions into Na2Ca3Si2O8, energy transfer from Ce3+ to Tb3+ and Ce3+ to Mn2+ ions is observed from the spectral overlap between Ce3+ emission and Tb3+/Mn2+ excitation spectra. The energy-transfer efficiencies and corresponding mechanisms are discussed in detail. The mechanism of energy transfer from Ce3+ to Tb3+ is demonstrated to be a dipole–quadrupole mechanism by the Inokuti–Hirayama model. The wavelength-tunable white light can be realized by coupling the emission bands centered at 440, 550 and 590 nm ascribed to the contribution from Ce3+, Tb3+ and Mn2+, respectively. The commission on illumination value of color tunable emission can be tuned by controlling the content of Ce3+, Tb3+ and Mn2+. Temperature-dependent luminescence spectra proved the good thermal stability of the as-prepared phosphor. White LEDs with CRI = 93.5 are finally fabricated using a 365 nm UV chip and the as-prepared Na2Ca3Si2O8:Ce3+,Tb3+,Mn2+ phosphor. All the results suggest that Na2Ca3Si2O8:Ce3+,Tb3+,Mn2+ can act as potential color-tunable and single-phase white emission phosphors for possible applications in UV based white LEDs.

Graphical abstract: Tunable white light of a Ce3+,Tb3+,Mn2+ triply doped Na2Ca3Si2O8 phosphor for high colour-rendering white LED applications: tunable luminescence and energy transfer

Back to tab navigation

Publication details

The article was received on 27 Mar 2017, accepted on 21 Jun 2017 and first published on 21 Jun 2017


Article type: Paper
DOI: 10.1039/C7DT01086A
Citation: Dalton Trans., 2017,46, 9272-9279
  •   Request permissions

    Tunable white light of a Ce3+,Tb3+,Mn2+ triply doped Na2Ca3Si2O8 phosphor for high colour-rendering white LED applications: tunable luminescence and energy transfer

    W. Lü, H. Xu, J. Huo, B. Shao, Y. Feng, S. Zhao and H. You, Dalton Trans., 2017, 46, 9272
    DOI: 10.1039/C7DT01086A

Search articles by author

Spotlight

Advertisements