title: Colour tuneability in sol-gel nano-glass-ceramics comprising Yb(3+)-Er(3+)-Tm3+ Co-doped NaYF4 nanocrystals.
abstract: White light can be obtained by up-conversion processes in a cheap and efficient way, being of great interest for lighting, displays, and photonic integrated devices. Here we report a generation of white light under 980 nm laser infrared excitation in Y(b3+)-Er(3+)-Tm3+ triply doped sol-gel derived nano-glass-ceramics containing NaYF4 nanocrystals where co-dopants ions are partitioned. Efficient simultaneous blue, green, and red up-conversion emissions give rise to a balanced white overall emission and corresponding up-conversion mechanisms have been analyzed. Changes in pump power intensity or heat treatment temperature widely vary the ratio of emission bands, resulting in a colour tuneability which has been analyzed and quantified in terms of CIE standard chromaticity diagram.
authors.affiliation: Departamento Física Fundamental y Experimental, Electrónica y Sistemas, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Méndez-Ramos
authors.forename: A C
authors.initials: AC
authors.lastname: Yanes
authors.forename: A
authors.initials: A
authors.lastname: Santana-Alonso
authors.forename: J
authors.initials: J
authors.lastname: Del-Castillo
authors.forename: V D
authors.initials: VD
authors.lastname: Rodríguez