LiNbO3: Yb3+/Er3+/Tm3+— power driven green to blue tunability

Triple-doped (Yb3+/Er3+/Tm3+) lithium niobate single crystals have been grown by the Czochralski method. Under selective Yb3+ excitation at 920nm, bright visible up-converted luminescence is observed. It is found that the emission spectra of triple-doped system can be described as the superposition...

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Bibliographic Details
Published inMaterials letters Vol. 96; pp. 63 - 66
Main Authors Marín-Dobrincic, Martina, Antonio Sanz-García, Juan, Cantelar, Eugenio, Cusso, Fernando
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2013
Subjects
color
Color tunability
crystals
energy transfer
LiNbO3
lithium
Luminescence
Up-conversion
Yb–Er–Tm
LiNbO3
Color tunability
Yb–Er–Tm
Up-conversion
Luminescence
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Summary:Triple-doped (Yb3+/Er3+/Tm3+) lithium niobate single crystals have been grown by the Czochralski method. Under selective Yb3+ excitation at 920nm, bright visible up-converted luminescence is observed. It is found that the emission spectra of triple-doped system can be described as the superposition of Yb3+-to-Er3+ and Yb3+-to-Tm3+ energy transfer up-conversion, which exhibit differential power dependencies. As a consequence, the triple-doped system exhibits both power and concentration dependent emission spectra. It is possible to select the appropriate concentration of dopants in order to attain a very wide range of green to blue color tunability, within a single crystal, easily controlled by adjusting excitation power density. ► Main up-conversion emissions in LiNbO3:Yb3+/Er3+/Tm3+ are characterized. ► Total color hue depends on pump power. ► Wide color tunability from green to blue is demonstrated. ► Color tunability is linked to saturation effects in the up-conversion mechanisms.
Bibliography:http://dx.doi.org/10.1016/j.matlet.2012.12.101
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.12.101