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TSPO1, diphenyl[4-(triphenylsilyl)phenyl]phosphine oxide, has a structure of triphenylsilane connecting triphenyl phosphine oxide. Comparing with UGH-2, TSPO1 has large permanent dipole moment due to the polar phosphine oxide group and its asymmetric structure.
With a sufficiently high triplet energy (ET ) of 3.36 eV, TSPO1 can be used as fluorescent host or exciton blocking layer materials in TADF-OLED devices. Also with low lying LUMO (ELUMO = 2.52 eV) and HOMO (EHOMO = 6.79 eV), TSPO1 is suitable for efficient electron injection and hole blocking, owing to the electron deficient nature of diphenylphosphine oxide moiety it bears.
Arylsilanes and siloxanes as optoelectronic materials for organic light-emitting diodes (OLEDs), D. Sun et al., J. Mater. Chem. C, 3, 9496 (2015); DOI: 10.1039/c5tc01638j.
δ-Carboline-based bipolar host materials for deep blue thermally activated delayed fluorescence OLEDs with high efficiency and low roll-off characteristic, J. Moon et al., RSC Adv., 8, 17025 (2018); DOI: 10.1039/c8ra01761a.
Suppressing Efficiency Roll-Off of TADF Based OLEDs by Constructing Emitting Layer With Dual Delayed Fluorescence, Y. Zhang et al., Front. Chem., 7, 302 (2019); doi: 10.3389/fchem.2019.00302.
Design Strategy for 25% External Quantum Efﬁ ciency in Green and Blue Thermally Activated Delayed Fluorescent Devices, D. Lee et al., Adv. Mater. 2015, 27, 5861–5867 (2015); DOI: 10.1002/adma.201502053.
High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility, Y-J. Cho et al., Adv. Mater., 26, 6642–6646 (2014); DOI: 10.1002/adma.201402188.
Highly luminescent palladium(II) complexes with sub-millisecond blue to green phosphorescent excited states. Photocatalysis and highly efficient PSF-OLEDs, P-K. Chow et al., Chem. Sci., 7, 6083-6098 (2016); DOI: 10.1039/C6SC00462H.
High efficiency (~ 100 lm W-1) hybrid WOLEDs by simply introducing ultrathin non-doped phosphorescent emitters in a blue exciplex host, S, Ying et al., J. Mater. Chem. C, 6, 7070 (2018); DOI: 10.1039/c8tc01736k.
Aromatic-Imide-Based Thermally Activated Delayed Fluorescence Materials for Highly Efficient Organic Light-Emitting Diodes, M. Li et al., Angew. Chem. Int. Ed., 56, 8818 –8822 (2017); DOI: 10.1002/anie.201704435.
High efficiency fluorescent white organic light-emitting diodes having a yellow fluorescent emitter sensitized by a blue thermally activated delayed fluorescent emitter, W. Song et al., Org. Electron., 23, 138–143 (2015); doi: 10.1016/j.orgel.2015.04.016.
External Quantum Efficiency Above 20% in Deep Blue Phosphorescent Organic Light‐Emitting Diodes, S. Jeon et al., adv. mater., 23, 1436 (2011); DOI: 10.1002/adma.201004372.
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