title: Ultraviolet-blue to near-infrared downconversion of Nd(3+)-Yb(3+) couple.
abstract: To reduce energy losses by thermalization of charge carriers in a silicon solar cell, quantum-cutting luminescent materials are desired for the efficient downconversion of UV-visible radiation into near-IR radiation. In this Letter, quantum cutting involving emission of two near-IR photons for each UV-blue photon absorbed is demonstrated in Nd(3+)/Yb(3+):beta-YF(3) nanocrystals embedded in transparent bulk-glass ceramics. Upon excitation of an Nd(3+) ion with a UV-blue photon, Yb(3+) ions emit two near-IR photons through an efficient two-step energy transfer from Nd(3+) to Yb(3+) with Nd(3+):(4)F(3/2) acting as the intermediate state.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Daqin
authors.initials: D
authors.lastname: Chen
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Yu
authors.forename: Hang
authors.initials: H
authors.lastname: Lin
authors.forename: Ping
authors.initials: P
authors.lastname: Huang
authors.forename: Zhifa
authors.initials: Z
authors.lastname: Shan
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Wang