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Başlık: High efficiency OLEDs based on anthracene derivatives: The impact of electron donating and withdrawing group on the performance of OLED
Yazarlar: Aydemir, Murat
Haykır, Gülçin
Battal, Ahmet
Jankus, Vygintas
Sugunan, Sunish K.
Dias, Fernando B.
Al-Attar, Hameed
Türksoy, Figen
Monkman, Andrew P.
Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Kimya Bölümü.
0000-0002-9466-1111
Tavaslı, Mustafa
AAB-1630-2020
6506308760
Anahtar kelimeler: Materials science
Physics
Anthracene derivatives
TTA
TADF
Material crystalization
Light-emitting-diodes
Delayed fluorescence
P-type
Emission
Devices
States
Ir(ppy)(3)
Exciplex
Singlet
Ptoep
Anthracene
Charge transfer
Efficiency
Molecules
Anthracene derivatives
Crystalization
High current densities
Low current density
Photophysical studies
TADF
Theoretical values
Triplet-triplet annihilation
Organic light emitting diodes (OLED)
Yayın Tarihi: Mar-2016
Yayıncı: Elsevier
Atıf: Aydemir, M. vd. (2016). "High efficiency OLEDs based on anthracene derivatives: The impact of electron donating and withdrawing group on the performance of OLED". Organic Electronics, 30, 149-157.
Özet: New well-defined bulky anthracene derivatives with side groups having electron donating or withdrawing properties 8a-d were synthesized. The compounds contain substituted anthracene as the central core attaching 2-(4-(2-pyridinyl)-phenyl)vinyl and 4-R-phenyl [R:H (a), OMe (b) and CF3 (c), N(Ph)(2) (d)] groups at 9- and 10-positions. The impact of electron donating, withdrawing and neutral groups and their influence on the molecules photophysical, charge transfer (CT), triplet transfer (TT) and triplet-triplet annihilation (TTA) properties has been investigated. Based on the photophysical studies the most promising molecule (8d) has been selected and high efficiency fluorescent OLEDs with EQE at very low current efficiency reaching 7% were obtained. The value at low current density implies a Triplet Fusion (TF) contribution of 45%, very close to the maximum theoretical value of 50% when only the singlet decay channel is open to TTA, however we believe that in this case both TTA and TADF contribute to the triplet harvesting to yield high EQE values, and this mixed triplet harvesting arises through the heterogeneity of the films. At high current density a brightness of 20000 cd/m(2) was achieved and it is assigned partially to the material crystallisation.
URI: https://doi.org/10.1016/j.orgel.2015.11.026
https://www.sciencedirect.com/science/article/pii/S156611991530207X
http://hdl.handle.net/11452/26539
ISSN: 1566-1199
1878-5530
Koleksiyonlarda Görünür:Scopus
Web of Science

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