Order Code: M2132A1
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General Information

CAS number 1019842-99-9
Full name 2,8-Bis(diphenyl-phosphoryl)-dibenzo[b,d]thiophene
Chemical formula C36H26O2P2S
Molecular weight 584.60 g/mol
Absorption λmax 312, 328 nm in DCM
Fluorescence λem 350 nm in DCM
HOMO/LUMO HOMO = 6.7 eV, LUMO = 3.0 eV (ET = 3.1 eV) [1]
Synonyms DPDT, PO15
Classification / Family Dibenzothiophene derivatives, Organic electronics, Electron-transport layer materials (ETL), Phosphorescent host materials, TADF-OLEDs, Sublimed materials.

Product Details

Purity Sublimed: 99.81% (HPLC)
Melting point TGA: >320 °C (0.5% weight loss)
Appearance Yellow 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.


dpdt chemical structure
Chemical structure of PPT; CAS No. 1019842-99-9.



PPT is an ambipolar phosphorescent host materials with an electron-rich dibenzothiophene core and two electron-deficient diphenyl-phosphoryl side arms.  For this reason, PPT is a good electron-transport material with higher electron mobility rate, offering better electron injection.

Due to its wide bandgap and high triplet energy level for highly-efficient TADF-OLED devices, PPT is normally used to host blue light-emitting materials (such as FIrPic). PPT is also used with electron-donating materials to form exciplexes with delayed fluorescence to enhance electroluminescence efficiency.


Device structure ITO/m-MTDATA (35 nm)/50 mol.% m-MTDATA:PPT (30 nm)/PPT (35 nm)/LiF (0.8 nm)/Al [1]
Colour Orange  orange
Max. EQE 10%
Max. Power Efficiency 47.0 lm W-1
Device structure  ITO/TAPC (40 nm)/TCTA (2 nm)/26DCzPPy:TCTA:FIrpic (0.4:0.4:0.2) (5 nm)/26DCzPPy:PPT:FIrpic (0.4:0.4:0.2) (5 nm)/3TPYMB (55 nm)/CsF (2 nm)/Al (180 nm) [2]
Colour Blue   blue
Power Efficiency @ 1000 cd/m2 24 lm W−1
Current Efficiency @ 1000 cd/m2 42 cd/A
Power Efficiency @ 1000 cd/m2 30 lm/W
Device structure ITO/HATCN (10 nm)/Tris-PCz (35 nm)/10 wt. % 4CzPN:mCBP (G-EML) (5 nm)/6 wt. % 4CzPN:2 wt. % 4CzTPN-Ph:mCBP (R-EML) (4 nm)/10 wt. % 3CzTRZ:PPT (B-EML) (6 nm)/PPT (50 nm)/LiF (0.8 nm)/Al (100 nm) [3]
Colour White white
Max. Current Efficiency 45.6 cd/A 
Max. EQE 17.0%
Max. Power Efficiency 34.1 lm W-1
Device structure ITO/HATCN (10 nm)/Tris-PCz (35 nm)/10 wt. % 4CzPN:mCBP (G-EML) (5 nm)/6 wt. % 4CzPN:2 wt. % 4CzTPN-Ph:mCBP (R-EML) (4 nm)/10 wt. % 3CzTRZ:PPT (B-EML) (6 nm)/PPT (50 nm)/LiF (0.8 nm)/Al (100 nm) [3]
Colour White white
Max. Current Efficiency 13.13 cd/A 
Max. EQE 6.8%
Max. Power Efficiency 4.75 lm W-1

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


Literature and Reviews

  1. Efficient organic light-emitting diodes through up-conversion from triplet to singlet excited states of exciplexes, K. Goushi et al., Appl. Phys. Lett. 101, 023306 (2012); doi: 10.1063/1.4737006.
  2. Blue and white phosphorescent organic light emitting diode performance improvementbyconfining electrons and holes inside double emitting layers, Y-S.Tsai et al., J. Luminescence 153, 312–316 (2014); doi: 10.1016/j.jlumin.2014.03.040.
  3. High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence, J. Nishide et al., Appl. Phys. Lett. 104, 233304 (2014); doi: 10.1063/1.4882456.
  4. An Ambipolar BODIPY Derivative for a White Exciplex OLED and Cholesteric Liquid Crystal Laser toward Multifunctional Devices, M. Chapran et al., ACS Appl. Mater. Interfaces, 9, 4750−4757 (2017); DOI: 10.1021/acsami.6b13689.
  5. Highly Efficient Sky-Blue Fluorescent Organic Light Emitting Diode Based on Mixed Cohost System for Thermally Activated Delayed Fluorescence Emitter (2CzPN), J. Sun et al., ACS Appl. Mater. Interfaces, 8, 9806−9810 (2016); DOI: 10.1021/acsami.6b00286.