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Elucidating Deviating Temperature Behavior of Organic Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells
Author(s) -
RàfolsRibé Joan,
GraciaEspino Eduardo,
Jenatsch Sandra,
Lundberg Petter,
Sandström Andreas,
Tang Shi,
Larsen Christian,
Edman Ludvig
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202001405
Subject(s) - oled , materials science , optoelectronics , anode , luminance , diode , organic semiconductor , optics , nanotechnology , electrode , layer (electronics) , chemistry , physics
Organic light‐emitting diodes (OLEDs) and light‐emitting electrochemical cells (LECs) exhibit different operational modes that render them attractive for complementary applications, but their dependency on the device temperature has not been systematically compared. Here, the effects of a carefully controlled device temperature on the performance of OLEDs and LECs based on two common emissive organic semiconductors are investigated. It is found that the peak luminance and current efficacy of the two OLEDs are relatively temperature independent, whereas, the corresponding LECs exhibit a significant increase by ≈85% when the temperature is changed from 20 to 80 °C. A combination of simulations and measurements reveal that this deviating behavior is consistent with a shift of the emission zone from closer to the transparent anode toward the center of the active material for both the OLEDs and the LECs, which in turn can be induced by a stronger positive temperature dependence of the mobility of the holes than the electrons.