Open AccessUpconversion emissions from high-energy states of Eu^3+ sensitized by Yb^3+ and Ho^3+ in β-NaYF_4 microcrystals under 980 nm excitation
Author(s) -
Lili Wang,
Zhenyu Liu,
Zhe Chen,
Dan Zhao,
Guanshi Qin,
Weiping Qin
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.025471
Subject(s) - photon upconversion , ion , materials science , excitation , luminescence , ultraviolet , energy transfer , phosphor , doping , atomic physics , optics , optoelectronics , physics , quantum mechanics
Under 980 nm excitation, multiple ultraviolet and visible upconversion luminescence from Ho3+ and Eu3+ ions were observed in Yb3+/Ho3+/Eu3+ tri-doped NaYF4 microcrystals (MCs). The high-energy states (5H3-7, 5L6, 5D3 and 5D2) of Eu3+ ions could be efficiently populated by two-step energy transfer (ET) processes of Yb → Ho → Eu. Four-, three-, two-photon UC processes of Eu3+ ions were confirmed by the dependence of 5H3-7, 5L6 and 5D0 levels emission intensities on the pumping power.