OREGON STATE UNIVERSITY

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Transient brightness, current, and voltage characterization of organic light emitting devices

TitleTransient brightness, current, and voltage characterization of organic light emitting devices
Publication TypeJournal Article
Year of Publication2001
AuthorsNorris, B. J., and J. F. Wager
JournalJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures
Volume19
Issue2
Pagination546 - 550
Date Published03/2001
ISSN0734211X
Keywordscharge injection, light emitting diodes, organic compounds, transients
Abstract

Transient current–transient voltage [i(t)–v(t)], transient brightness–transient current [b(t)–i(t)], and transient brightness–transient voltage [b(t)–v(t)] analysis are introduced as novel organic light emitting device (OLED) characterization methods. These analysis methods involve measurement of the instantaneous voltage [v(t)] across, the instantaneous current [i(t)] through, and the instantaneous brightness [b(t)] from an OLED when it is subjected to a bipolar, piecewise-linear applied voltage waveform. Employing these characterization methods, two important OLED device physics conclusions are obtained: (1) Hole accumulation at the electron transport layer (ETL)/hole transport layer (HTL) interface plays an important role in establishing balanced charge injection of electrons and holes into the OLED. (2) Hole accumulation at the ETL/HTL interface is more important in establishing the ac conduction characteristics than charge trapping in the ETL.

DOI10.1116/1.1358858
Short TitleJ. Vac. Sci. Technol. B