Bandwidth Dependency of (O)LEDs on Bias current

Burton, Andrew, Haigh, Paul Anthony, Chvojka, Petr, Ghassemlooy, Zabih and Zvanovec, Stanislav (2020) Bandwidth Dependency of (O)LEDs on Bias current. In: 2020 3rd West Asian Symposium on Optical and Millimeter-wave Wireless Communication (WASOWC). Institute of Electrical and Electronics Engineers Inc., Piscataway, NJ, pp. 1-6. ISBN 9781728186924, 9781728186917

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This work investigates the modulation bandwidth (Bmod) dependency of organic and non-organic light emitting diodes (OLED\LED) on the applied bias current (IB). The equivalent lumped element transient circuit models are shown with the critical components empirically extracted for both types of device. Four OLEDs of varying sizes are tested in addition to four high power LEDs (white phosphor, red, green and blue). Through analysis of the current-voltage characteristics, the device and dynamic diode resistances are determined as well as the ideality factors. We show that OLEDs have higher ideality factors to the traditional LEDs (almost double) hence the increased turn-on voltage, however have similar AC drive voltage characteristics across the emitting portion of the device between 8-12%. Furthermore, both devices exhibit an increase in Bmod with an increase in IB. It is shown that the OLEDs Bmod increases linearly in relation to IB, reaching =80% of the maximal Bmod at =60% of their maximum IB rating. Conversely, the LEDs display an exponential rise in Bmod in relation to IB, with =80% of the maximal Bmod at =35% of their maximum IB rating, with the red LED showing the greatest results at just 17%.

Item Type: Book Section
Additional Information: Funding Information: This project is supported by UK EPSRC grant EP/P006280/1: MARVEL and the H2020 MSC ITN 764461 (VISION).
Uncontrolled Keywords: LED, modulation bandwidth, OLED, transient analysis, visible light communications
Subjects: G400 Computer Science
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 09 Jun 2021 13:34
Last Modified: 31 Jul 2021 11:02

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