TY - JOUR
T1 - The role of orientation in the MEL response of OLEDs
AU - Engmann, Sebastian
AU - Bittle, Emily G.
AU - Richter, Lee J.
AU - Hallani, Rawad K.
AU - Anthony, John E.
AU - Gundlach, David J.
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2021.
PY - 2021/8/21
Y1 - 2021/8/21
N2 - Magneto electroluminescence (MEL) is emerging as a powerful tool to study spin dynamics in organic light emitting diodes (OLEDs). The shape of the MEL response is typically used to draw qualitative inference on the dominant process (singlet fission or triplet fusion) in the device. In this study, we develop a quantitative model for MEL and apply it to devices based on rubrene, and three solution processable anthradithiophene emitters. The four emitters allow us to systematically vary the film structure between highly textured, poly-crystalline to amorphous. We find significant diversity in the MEL, with the textured films giving highly structured responses. We find that the additional structure does not coincide with energy anti-crossings, but intersections in the singlet character between adjacent states. In all cases the MEL can be adequately described by an extended Merrifield model.Viathe inclusion of charge injection, we are able to draw additional information on underlying physics in OLED devices.
AB - Magneto electroluminescence (MEL) is emerging as a powerful tool to study spin dynamics in organic light emitting diodes (OLEDs). The shape of the MEL response is typically used to draw qualitative inference on the dominant process (singlet fission or triplet fusion) in the device. In this study, we develop a quantitative model for MEL and apply it to devices based on rubrene, and three solution processable anthradithiophene emitters. The four emitters allow us to systematically vary the film structure between highly textured, poly-crystalline to amorphous. We find significant diversity in the MEL, with the textured films giving highly structured responses. We find that the additional structure does not coincide with energy anti-crossings, but intersections in the singlet character between adjacent states. In all cases the MEL can be adequately described by an extended Merrifield model.Viathe inclusion of charge injection, we are able to draw additional information on underlying physics in OLED devices.
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U2 - 10.1039/d1tc00314c
DO - 10.1039/d1tc00314c
M3 - Article
AN - SCOPUS:85112681457
SN - 2050-7534
VL - 9
SP - 10052
EP - 10064
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 31
ER -