Bandwidth Dependency of (O)LEDs on Bias current

Andrew Burton, Paul Anthony Haigh, Petr Chvojka, Zabih Ghassemlooy, Stanislav Zvanovec

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

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%.

Original languageEnglish
Title of host publication3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781728186917
ISBN (Print)9781728186924
DOIs
Publication statusPublished - 24 Nov 2020
Event3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020 - Tehran, Iran, Islamic Republic of
Duration: 24 Nov 202025 Nov 2020

Publication series

Name3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020

Conference

Conference3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020
CountryIran, Islamic Republic of
CityTehran
Period24/11/2025/11/20

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