Abstract
The upconversion (UC) emission of single LiYF4:Yb3+/Ho3+ microparticle with codoped Ce3+ is investigated. The UC emission tuning from green to red in single LiYF4:Yb3+/Ho3+ microparticle is successfully obtained by codoping Ce3+ ions with different concentrations, and the enhancement mechanism of red emission is discussed in detail. The results indicate that two efficient cross-relaxations between Ho3+ and Ce3+ enhance the red and suppress the green emission in the UC process. The investigation on the luminescence property of a single microcrystal can effectively avoid the influence of the particles around and provide more precise information for better exploring the UC mechanism. The current study on the multicolor tuning of RE-doped micromaterials is also important for extending the application of rare-earth-doped micromaterials in micro-optoelectronic devices, color displays, and anticounterfeiting applications.
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