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SPPO13, n-type solution-processable ETL material
Universal bipolar co-host for blue, green and red phosphors
SPPO13, 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene, has a structure with an electron donating spirobifluorene core surrounded by two identical electron withdrawing diphenylphosphine oxide groups, while SPPO1 has only one diphenylphosphine oxide group attached to the spirobifluorene.
Due to its electron deficient nature, SPPO13 is used as an n-type solution-processable electron transporting material. SPPO13 could also be used as universal bipolar co-host for blue, green and red phosphors while blending with hole transporting materials such as tris(4-carbazoyl-9-ylphenyl)amine (TCTA).
An Amorphous Spirobifluorene-Phosphine-Oxide Compound as the Balanced n-Type Host in Bright and Efficient Light-Emitting Electrochemical Cells with Improved Stability, S. Tang et al., Adv. Optical Mater., 9, 2002105 (2021); DOI: 10.1002/adom.202002105..
A novel blue fluorescent polymer for solution-processed fluorescent–phosphorescent hybrid WOLEDs, J. Wang et al., J. Mater. Chem. C, 3, 2856 (2015); DOI: 10.1039/c4tc02899f.
Solution-processable small molecules as efficient universal bipolar host for blue, green and red phosphorescent inverted OLEDs. J. Chen et al., J. Mater. Chem., 22, 5164-5170 (2012); DOI: 10.1039/C2JM16463A.
High power efficiency in simplified two layer blue phosphorescent organic light-emitting diodes, S. Jang et al., Org. Electronics 11 (6), 1154-1157 (2010); DOI: 10.1016/j.orgel.2010.04.004.
Fabrication and Efficiency Improvement of Soluble Blue Phosphorescent Organic Light-Emitting Diodes Using a Multilayer Structure Based on an Alcohol-Soluble Blue Phosphorescent Emitting Layer, K. Yook et al., Adv. Mater., 22 (40), 4479-4483 (2010); DOI: 10.1002/adma.201002034.
Small Molecule Approach to Passivate Undercoordinated Ions in Perovskite Light Emitting Diodes: Progress and Challenges, J. Lee et al., Adv. Optical Mater., 10 (1), 2101361 (2021); DOI: 10.1002/adom.202101361.
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