Open AccessIntense infrared emission of Er^3+ in Ca_8Mg(SiO_4)_4Cl_2 phosphor from energy transfer of Eu^2+ by broadband down-conversion
Author(s) -
Jiajia Zhou,
Yan Teng,
Xiaofeng Liu,
Ye Song,
Xin Xu,
Zhijun Ma,
Jianrong Qiu
Publication year - 2010
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.18.021663
Subject(s) - phosphor , materials science , infrared , band gap , germanium , optoelectronics , emission spectrum , ultraviolet , absorption (acoustics) , emission intensity , energy conversion efficiency , optics , analytical chemistry (journal) , spectral line , luminescence , physics , chemistry , silicon , astronomy , composite material , chromatography
We report on conversion of near-ultraviolet and visible radiation ranging from 250 to 500 nm into near-infrared emission by a Ca(8)Mg(SiO(4))(4)Cl(2): Eu(2+), Er(3+) phosphor. Efficient 1530-1560 nm Er(3+) emission ((4)I(13/2)-->(4)I(15/2)) was detected under the excitation of Eu(2+) (4f?5d) absorption band as a result of energy transfer from Eu(2+) to Er(3+), which is confirmed by both steady state and time-resolved emission spectra. The laser power dependent emission intensity changes were investigated to analysis the energy transfer mechanism. Energy transfer from Eu(2+) to Er(3+) followed by a multi-photon quantum cutting of Er(3+) is proposed. The result indicates that the phosphor has potential application in enhancement of conversion efficient of germanium solar cells because the energy difference of Er(3+): (4)I(13/2)-->(4)I(15/2) transition matches well with the bandgap of Ge (Eg~0.785 eV).