40.20 DIS ballot initiated: 12 weeks Mar 25, 2024
ISO
ISO/TC 206 Fine ceramics
International Standard
81.060.30 Advanced ceramics
This document describes test methods using an integrating sphere to measure the optical properties of ceramic phosphor powders, which are used in white light-emitting diodes (LEDs) and emit visible light when excited by UV or blue light. It specifies an absolute method to measure internal quantum efficiency and a substitution method to measure external quantum efficiency and absorptance. The substitution method uses reference materials whose external quantum efficiency and absorptance have been obtained in accordance with ISO 23946.
PUBLISHED
ISO 20351:2017
IN_DEVELOPMENT
ISO/DIS 20351
40.20
DIS ballot initiated: 12 weeks
Mar 25, 2024