# ISO 20351:2017 — Withdrawn and superseded ISO standards

For ISO 20351:2017, item title is Fine ceramics (advanced ceramics, advanced technical ceramics) —  Absolute measurement of internal quantum efficiency of phosphors for white light emitting diodes using an integrating sphere; status code is 9599; successor is ISO 20351:2024; withdrawn / published date is 2017-09-08, recorded from its source on 2026-08-05.

- **Identifier:** ISO 20351:2017 _(verified: appears in the quote below)_
- **Item title:** Fine ceramics (advanced ceramics, advanced technical ceramics) —  Absolute measurement of internal quantum efficiency of phosphors for white light emitting diodes using an integrating sphere _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 20351:2024
- **Withdrawn / published date:** 2017-09-08 _(verified: appears in the quote below)_

## What the source says

> 67758,IS,,ISO 20351:2017,"Fine ceramics (advanced ceramics, advanced technical ceramics) — Absolute measurement of internal quantum efficiency of phosphors for white light emitting diodes using an integrating sphere","Céramiques fines (céramiques avancées, céramiques techniques avancées) — Mesurage absolu du rendement quantique interne des luminophores des diodes électroluminescentes blanches en utilisant une sphère intégrante",2017-09-08,1,['81.060.30'],ISO/TC 206,9599,,[86861],['en'],10,"<p>ISO 20351:2017 specifies a method of absolute measurement (using an integrating sphere) of internal quantum efficiency of phosphor powders which are excited by UV or blue light and emit visible light,

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).