• Title/Summary/Keyword: Luminescence properties

Search Result 482, Processing Time 0.022 seconds

X-ray Crystal Structure and Luminescence Properties of Pd(II) and Pt(II) Complexes with Dithiopyrrole

  • Kang, Jun-Gill;Cho, Dong-Hee;Park, Changmoon;Kang, Sung Kwon;Kim, In Tae;Lee, Sang-Woo;Lee, Ha-Hyeong;Lee, Young-Nam;Lim, Dae-Won;Lee, Sung-Jae;Kim, Sung-Ho;Bae, Young-Ju
    • Bulletin of the Korean Chemical Society
    • /
    • v.29 no.3
    • /
    • pp.599-603
    • /
    • 2008

  • The complexes Pd(nbmtp)Cl2 and Pt(nbmtp)Cl2 (nbmptp = 1-nonyl-3,4-bis(methylthio)pyrrole) were prepared and their x-ray structures were determined at room temperature. The four-coordinated metal unit and the pyrrole ring formed a nearly planar geometry. The free ligand dissolved in CH2Cl2 produced two luminescence bands associated with the lone-pair electron of S (l max = 525 nm) and the pyrrole p electron (l max = 388 nm). When the two complexes were dissolved in CH2Cl2, these two luminescence bands were also observed, although the low-energy band was blueshifted. For the crystalline Pt(II) complex, only the strong charge transfer band (l max = 618 nm) from the d* orbital of Pt resulted from excitation of the lone-pair electron of S.

  • https://doi.org/10.5012/bkcs.2008.29.3.599 인용 PDF KSCI

Effects of sodium dodecyl sulfate surfactant on up-conversion luminescence of Er3+/Yb3+-codoped NaLa(MoO4)2 nanocolloidal phosphor prepared by pulsed laser ablation in water

  • Kang, SukHyun;Jung, Kyung-Hwan;Kim, Kang Min;Kim, Won Rae;Han, HyukSu;Mhin, Sungwook;Son, Yong;Shim, Kwang Bo;Lee, Jung-Il;Ryu, Jeong Ho
    • Journal of Ceramic Processing Research
    • /
    • v.20 no.2
    • /
    • pp.158-163
    • /
    • 2019

  • Er3+/Yb3+-codoped NaLa(MoO4)2 colloidal nanocrystals were synthesized by pulsed laser ablations in de-ionized water and sodium dodecyl sulfate (NaC12H25SO4, SDS) aqueous solution for up-conversion (UC) luminescence bio-labeling applications. The influences of the SDS molecules on the crystallinities, crystal morphologies, crystallite sizes, and UC luminescence properties of the prepared Er3+/Yb3+-codoped NaLa(MoO4)2 colloidal nanocrystals were investigated in detail. Under a 980-nm excitation, the Er3+/Yb3+-codoped nanocolloidal NaLa(MoO4)2 suspension exhibited a weak red emission near 670 nm and strong green UC emissions at 530 and 550 nm, corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). When the SDS solution was used, a smaller average crystallite size, narrower size distribution, and enhanced UC luminescence were observed. These characteristics were attributed to the amphoteric SDS molecules attached to the positively charged Er3+/Yb3+-codoped NaLa(MoO4)2 colloidal nanocrystals, effectively occupying the oxygen defect on their surfaces. The Er3+/Yb3+-codoped nanocrystalline NaLa(MoO4)2 suspension prepared in the SDS solution exhibited a remarkably strong green emission visible to the naked eyes.