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Product Code M2333A1-250mg
Price £400 ex. VAT

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).

General Information

CAS number 1234510-13-4
Full name 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene
Chemical formula C49H34O2P2
Molecular weight 716.74 g/mol
Absorption λmax 282 nm (in DCM)
Phosphorescene λmax 373 nm (in DCM)
HOMO/LUMO HOMO 5.90 eV, LUMO 2.60 eV [1]
Synonyms 9,9'-spirobi[fluorene]-2,7-diylbis(diphenylphosphine oxide)
Classification / Family Spirobifluorene derivatives, TADF Light-emitting diodes, Organic electronics, Electron transport Layer (ETL), PHOLEDs cohost materials, Sublimed materials.

Product Details

Purity >99.0% (HPLC)
Melting point Tg = 123°C
Appearance White powder/crystals

Chemical Structure

SPPO13, 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene, 1234510-13-4
Chemical structure of 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13), CAS# 1234510-13-4.

Device Structure(s)

Device structure ITO/PEDOT:PSS (40 nm)/PTPATPPO:Ir(2-phq)2acac* (60 nm) (2 wt%)/SPPO13 (70 nm)/Al (100 nm) [2]
Colour blue light emitting device Blue
Max. Power Efficiency 42.7 lm W-1
Max. EQE 6.1%
Device structure ITO/PEI:Li2CO3/SPPO13:TCTA:FIrPic/TCTA/MoO3/Al [3]
Colour blue light emitting device Blue
Max. Current Efficiency 34.3 cd/A
Max. Power Efficiency 20.5 lm W-1
Max. EQE 15.2%
Device structure ITO/PEI:Li2CO3/SPPO13:TCTA:Ir(mppy)3/TCTA/MoO3/Al [3]
Colour green light emitting device Green
Max. Current Efficiency 56.9 cd/A
Max. Power Efficiency 35.4 lm W-1
Max. EQE 16.3%
Device structure ITO/PEI:Li2CO3/SPPO13:TCTA:Ir(MDQ)2(acac)/TCTA/MoO3/Al [3]
Colour red light emitting device Red
Max. Current Efficiency 12.0 cd/A
Max. Power Efficiency 7.9 lm W-1
Max. EQE 10.8%

*For chemical structure information, please refer to the cited references.


Grade Order Code Quantity Price
>99.0% purity (HPLC) M2333A1 250 mg £400
>99.0% purity (HPLC) M2333A1 500 mg £660
>99.0% purity (HPLC) M2333A1 1 g £1150

MSDS Documentation


Literature and Reviews

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