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Product Code M2292A1-250mg
Price £300 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.

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 £300
Sublimed (>99.0% purity) M2292A1 500 mg £560
Sublimed (>99.0% purity) M2292A1 1 g £1000

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.

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