title: Local analysis of Eu2+emission in CaAlSiN3.
abstract: We have investigated the local luminescence properties of Eu-doped CaAlSiN3by using low-energy electron beam (e-beam) techniques. The particles yield broad emission centered at 655 nm with a shoulder at higher wavelength under light excitation, and a broad band around 643 nm with a tail at 540 nm under e-beam excitation. Using cathodoluminescence (CL) in a scanning electron microscope (SEM), we have observed small and large particles, which, although with different compositions, exhibit Eu2+-related emissions at 645 and 635 nm, respectively. Local CL measurements reveal that the Eu2+emission may actually consist of several bands. In addition to the red broad band, regularly spaced sharp peaks have been occasionally observed. These luminescence variations may originate from a variation in the composition inside CaAlSiN3.
authors.affiliation: ICYS-MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dierre
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeda
authors.affiliation: Nano Device Characterization Group, MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan; Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-0003, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sekiguchi
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Suehiro
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan; Nano Device Characterization Group, MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan; Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-0003, Japan.
authors.forename: Kohsei
authors.initials: K
authors.lastname: Takahashi
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Yamamoto
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Rong-Jun
authors.initials: RJ
authors.lastname: Xie
authors.affiliation: Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Hirosaki
keywords: CaAlSiN3; Eu; electron beam; luminescence; oxynitride; phosphors