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SPPO1, 9,9-Spirobifluoren-2-yl-diphenyl-phosphine oxide has a spirobifluorene structure with an electron deficient polar diphenyl-phosphine oxide moiety attached. The polarity in the P=O double bond can lead to a high triplet energy state, which is highly desirable in host materials for an efficient host-to guest energy transfer in an OLED.
SPPO1 can either be used as blue phosphorescent host or, due to its electron deficient nature, in OLED devices as an electron transport/hole blocking layer material. As a phosphorescent host, SPPO1 based blue PHOLEDs show much higher quantum efficiency than the well-known mCP based blue PHOLEDs.
λmax 317 nm (dichloromethane)
λem 347 nm (dichloromethane)
HOMO = 6.5 eV, LUMO = 2.8 eV; ET = 2.8 eV 
Classification / Family
Phosphine oxide derivatives, Phosphorescent host materials, Electron transport materials, Hole blocking layer materials, Sublimed materials, Semiconducting small molecules
A high triplet energy phosphine oxide derivative as a host and exciton blocking material for blue phosphorescent organic light-emitting diodes,S. Jeon et al., Thin Solid Films, 518 (14), 3716-3720 (2010); DOI: 10.1016/j.tsf.2009.10.012.
Efficient white phosphorescent organic light‐emitting diodes for solid‐state lighting applications using an exciton‐confining emissive‐layer structure, J. Lee et al., J. Infor. Display, 10 (2), 92-95 (2009); DOI: 10.1080/15980316.2009.9652088.
Simplified Bilayer White Phosphorescent Organic Light-Emitting Diodes, J. Lee et al., ETRI J. 38 (2); 260-264 (2016); DOI: 10.4218/etrij.16.2515.0011.
Solution Processed Blue Phosphorescent Organic Light Emitting Diodes Using a Phosphine Oxide Host Material, K. Yook et al., Electrochem. Solid-State Lett., 13 (6) J71-J73 (2010); DOI: 10.1149/1.3367630.
Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle, S. Ming et al., Chin. Phys. B 21 (10), 108507 (2012); DOI: 10.1088/1674-1056/21/10/108507.
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.
To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.