Term: double injection https://doi.org/10.1351/goldbook.08792 Definition: Simultaneous injection of both types of charge carriers (electrons and holes) into a material or a device. Note: Double injection is used in production of electrets and function of light-emitting diodes. Related Term: light-emitting diodes (http://doi.org/10.1351/goldbook.08836). Related Term: electrets (http://doi.org/10.1351/goldbook.08795). Related Term: charge carriers (http://doi.org/10.1351/goldbook.08775). Related Term: holes (http://doi.org/10.1351/goldbook.08826). Source: PAC, 2022, 94, 15. 'Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)' on page 24 (https://doi.org/10.1515/pac-2020-0501) Citation: 'double injection' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08792 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.