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Enhancement through sensitization of VUV‐excited luminescence in red‐emitting pentaborate phosphors
Author(s) -
Mikhailik V. B.,
Kraus H.
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201025626
Subject(s) - phosphor , luminescence , excitation , ion , excited state , sensitization , absorption (acoustics) , materials science , emission intensity , photon , optoelectronics , wavelength , analytical chemistry (journal) , emission spectrum , chemistry , atomic physics , optics , spectral line , physics , organic chemistry , quantum mechanics , chromatography , astronomy , immunology , composite material , biology
We studied the feasibility of using sensitization for the improvement of the VUV‐to‐visible conversion efficiency of red‐emitting pentaborate phosphor. It is shown that Tb 3+ ions that exhibit a strong absorption throughout the 160–230 nm wavelength range facilitate enhancement of Eu 3+ emission in TbMgB 5 O 10 –Eu at excitation in this spectral range. The maximum increase of the Eu 3+ emission efficiency in a pentaborate host at excitation with 150 nm photons is ca.10%. It is also shown that substitution of Zn for Mg in Gd(Mg,Zn)B 5 O 10 –Mn phosphor results in strong (up to 2.4 times) enhancement of the intensity of Mn 2+ emission. A possible reason for the observed host sensitization effect is discussed.
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