These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: 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: Lü W, Xu H, Huo J, Shao B, Feng Y, Zhao S, You H.
    Journal: Dalton Trans; 2017 Jul 18; 46(28):9272-9279. PubMed ID: 28686278.
    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.
    [Abstract] [Full Text] [Related] [New Search]