title: pH sensor based on upconverting luminescent lanthanide nanorods.
abstract: The pH sensor exploits the phenomenon of upconversion luminescence and is based on a hydrogel matrix containing (a) nanorods of the NaYF(4):Er,Yb type that can be excited with 980-nm laser light to give a green and red (dual) emission, and (b) a longwave absorbing pH probe that causes a pH-dependent inner filter effect.
authors: Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany.
authors: Li-Ning
authors: LN
authors: Sun
authors: Hongshang
authors: H
authors: Peng
authors: Matthias I J
authors: MI
authors: Stich
authors: Daniela
authors: D
authors: Achatz
authors: Otto S
authors: OS
authors: Wolfbeis