TY - GEN
T1 - Bandwidth Dependency of (O)LEDs on Bias current
AU - Burton, Andrew
AU - Haigh, Paul Anthony
AU - Chvojka, Petr
AU - Ghassemlooy, Zabih
AU - Zvanovec, Stanislav
N1 - Funding Information:
This project is supported by UK EPSRC grant EP/P006280/1: MARVEL and the H2020 MSC ITN 764461 (VISION).
PY - 2020/11/24
Y1 - 2020/11/24
N2 - 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%.
AB - 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%.
KW - LED
KW - modulation bandwidth
KW - OLED
KW - transient analysis
KW - visible light communications
UR - http://www.scopus.com/inward/record.url?scp=85105605123&partnerID=8YFLogxK
U2 - 10.1109/WASOWC49739.2020.9410027
DO - 10.1109/WASOWC49739.2020.9410027
M3 - Conference contribution
AN - SCOPUS:85105605123
SN - 9781728186924
T3 - 3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020
BT - 3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020
PB - Institute of Electrical and Electronics Engineers Inc.
CY - Piscataway, NJ
T2 - 3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communications, WASOWC 2020
Y2 - 24 November 2020 through 25 November 2020
ER -