title: Ultraviolet upconversion emissions of Gd3+.
abstract: Under 980 nm excitation, upconversion (UC) emissions in the UV range of 270-320 nm were observed in nanocrystals Y(0.795-x)Gd(x)Yb(0.2)Tm(0.005)F(3) (x=0, 0.1, 0.2, 0.5, and 0.795), which were synthesized through a hydrothermal method. These UC emissions can be assigned to the transitions of (6)I(J), (6)P(J)-->(8)S(7/2)(Gd(3+)), and (3)P(0)/(1)I(6)-->(3)H(6) (Tm(3+)). The energy transfer from Tm(3+) to Gd(3+) plays a crucial role in populating the excited states of Gd(3+). The shortest wavelength of upconverted emission converted from the infrared region was demonstrated here.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Cao
authors.forename: Weiping
authors.initials: W
authors.lastname: Qin
authors.forename: Jisen
authors.initials: J
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Peifen
authors.initials: P
authors.lastname: Zhu
authors.forename: Guodong
authors.initials: G
authors.lastname: Wei
authors.forename: Guofeng
authors.initials: G
authors.lastname: Wang
authors.forename: Ryongjin
authors.initials: R
authors.lastname: Kim
authors.forename: Lili
authors.initials: L
authors.lastname: Wang