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Product Code M2292A1
Price $338.00 ex. VAT

SPPO1, blue phosphorescent host

Host material for efficient host-to guest energy transfer in OLED devices

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.

General Information

CAS number 1125547-88-7
Chemical formula C37H25OP
Molecular weight 516.57 g/mol
Absorption λmax 317 nm (dichloromethane)
Photoluminescence λem 347 nm (dichloromethane)
HOMO/LUMO HOMO = 6.5 eV, LUMO = 2.8 eV; ET = 2.8 eV [1]
Chemical name 9,9-Spirobifluoren-2-yl-diphenyl-phosphine oxide
Synonyms 2-diphenylphosphine oxide-9,9'-spirobifluorene
Classification / Family Phosphine oxide derivatives, Phosphorescent host materials, Electron transport materials, Hole blocking layer materials, Sublimed materials, Semiconducting small molecules

Product Details

Purity Sublimed >99.0% (HPLC)
Melting point Tg= 96°C (lit.)
Appearance White powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the sublimed materials for OLED devices page.

Chemical Structure

SPPO1 chemical structure, CAS 1125547-88-7
Chemical structure of 9,9-Spirobifluoren-2-yl-diphenyl-phosphine oxide (SPPO1)

Device Structure(s)

Device structure ITO (70 nm)/TAPC (50 nm)/TCTA:FIrPic (7%, 10 nm)/TCTA:RD(7%, 0.5 nm)/TCTA:Ir(chppy)3 (7% 1.5 nm)/SPPO1:FIrPic (10%, 10 nm)/Tm3PyPB (20 nm)/Tm3PyPB:Cs (30 nm)/LiF (1 nm)/Al (120 nm) [2]
Colour white light emitting device White
Max. EQE 19%
Max. Power Efficiency 54.0 Im/W
Device structure ITO/TCTA (50 nm)/SPPO1:FIrPic (50 nm, 10%)/LiF/Al [3]
Colour blue light emitting device Blue
Max. Luminance 7,108 cd/m2
Max. EQE 12.3%
Device structure ITO/TCTA:(btc)2(acac)Ir (50 nm, 7%)/SPPO1 (50 nm)/LiF/Al [3]
Colour orange light emitting device Orange
Max. Luminance 16,410 cd/m2
Max. EQE 10.6%
Device structure ITO/TCTA:(btc)2(acac)Ir (50 nm, 7%)/SPPO1:FIrPic (50 nm, 10%)/LiF/Al [3]
Colour white light emitting device White
Max. Luminance 18,330cd/m2
Max. EQE 12.9%
Max. Current Efficiency 30.3 cd/A
Max. Power Efficiency 30.0 lm/W


Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2292A1 250 mg £270
Sublimed (>99.0% purity) M2292A1 500 mg £500
Sublimed (>99.0% purity) M2292A1 1 g £900

MSDS Documentation


Literature and Reviews

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.

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