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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on SmF3 by Materials Project

SmF3 crystallizes in the hexagonal P6_322 space group. The structure is three-dimensional. Sm3+ is bonded in a 4-coordinate geometry to twelve F1- atoms. There are a spread of Sm–F bond distances ranging from 2.33–2.92 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to three equivalent Sm3+ atoms. In the second F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent Sm3+ and one F1- atom. The F–F bond length is 2.49 Å. In the third F1- site, F1- is bonded to six equivalent Sm3+ and six equivalent F1- atoms to form face-sharing FSm6F6 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmF3 by Materials Project

SmF3 is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Sm–F bond distances ranging from 2.38–2.51 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted trigonal planar geometry to three equivalent Sm3+ atoms. In the second F1- site, F1- is bonded in a 3-coordinate geometry to three equivalent Sm3+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1993

A method of making a single layer multi-color luminescent display

The invention is a method of forming a multi-color luminescent display including the steps of depositing on an insulator substrate a smooth single layer of host material which itself may be a phosphor with the properties to host varying quantities of different impurities and introducing one or more of said different impurities into selected areas of the single layer of host material via an appropriately positioned mask as by thermal diffusion or ion-implantation to form a pattern of phosphors of different colors in the single layer of host material such that the top surface of the host layer remains smooth. Red phosphors are formed by adding impurities selected from the group consisting of Sm, SmF3, Eu, EuF3, and ZnS:MnTbF3 to a ZnS host; green phosphors by adding impurities selected from the group consisting of Tb and TbF3 to a ZnS host; and blue phosphors by adding impurities selected from the group consisting of Tm, Al, Ag, and Mg to a ZnS host.

Robertson, James B.↗