Product Code M2199A1
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TSPO1, diphenyl[4-(triphenylsilyl)phenyl]phosphine oxide, has a structure of triphenylsilane connecting triphenyl phosphine oxide. Comparing with UGH-2, TSPO1 has large permanent dipole moment due to the polar phosphine oxide group and its asymmetric structure. 

With a sufficiently high triplet energy  (ET ) of 3.36 eV, TSPO1 can be used as fluorescent host or exciton blocking layer materials in TADF-OLED devices. Also with low lying LUMO (ELUMO = 2.52 eV) and HOMO (EHOMO = 6.79 eV), TSPO1 is suitable for efficient electron injection and hole blocking, owing to the electron deficient nature of diphenylphosphine oxide moiety it bears.

General Information

CAS number 1286708-86-8
Full name Diphenyl[4-(triphenylsilyl)phenyl]phosphine oxide
Chemical formula C36H29OPSi
Molecular weight 536.67 g/mol
Absorption λmax 266 nm in DCM
Photoluminescence λmax 322 nm in DCM
HOMO/LUMO HOMO = 6.79 eV, LUMO = 2.52 eV; ET = 3.36 eV [1]
Synonyms Diphenylphosphine oxide-4-(triphenylsilyl)phenyl
Classification / Family Triphenylsilyl derivatives, Bipolar host materials, Electron Injection layer (EIL) materials, Hole Blocking layer (HBL) materials, Fluorescent host materials, TADF materials, Organic printing electronics.

Product Details

Purity Sublimed > 99% (HPLC)
Melting point 236 °C (lit.)
Appearance White crystals/powder

Chemical Structure

Chemical structure of TSPO1
Chemical structure of TSPO1

Device Structure(s)

Device structure ITO/HATCN (7nm)/TAPC (40 nm)/DCDPA (10 nm)/CzCbPy: 20 wt% DMAC-DPS (25 nm)/TSPO1 (5 nm)/TPBi (30 nm)/LiF (1.5 nm)/Al (100 nm) [2]
Colour Deep Blue  blue
Max. Luminance 8,035 cd/m2
Max. Current Efficiency 35.0 cd/A 
Max. EQE 22.9%
Device structure ITO/HATCN (5 nm)/NPB (60 nm)/MCP (5 nm)/15 wt% PXZ-CMO:mCP (30 nm)/TSPO1 (5 nm)/TPBi (30 nm)/LiF (0.5 nm)/Al (150 nm) [3]
Colour Green green
Max. Luminance 8,124 cd/m2
Max. Current Efficiency 38.2 cd/A 
Max. EQE 12.1%
Device structure PEDOT:PSS (60 nm)/TAPC (20 nm)/mCP (10 nm)/DPEPO: TmCzTrz (25 nm)/TSPO1 (5 nm)/TPBI (20 nm)/LiF (1 nm)/Al (200 nm) [4]
Colour Blue blue
Max. Power Efficiency 52.1 Im/W
Max. EQE 25.5%
Device structure ITO (50 nm)/PEDOT:PSS (60 nm)/poly(9-vinylcarbazole) (15 nm)/SiCz:4CzIPN (30 nm)/TSPO1 (35 nm)/LiF (1 nm)/Al (200 nm) [5]
Colour Green green
Max. Power Efficiency 63.4 Im/W
Max. EQE 26%
Device structure ITO/MoO3 (2 nm)/TAPC (40 nm)/TCTA (10 nm)/CzSi (3 nm)/CzSi:Pd-B-1* (10%):TTPA (1%) (20 nm)/TSPO1 (10 nm)/TmPyPb (40 nm)/LiF (1.2 nm)/Al (150 nm) [6]
Colour Green  green
Max Current Efficiency 38.85 cd/A 
Max EQE 10.41%
Max. Power Efficiency 38.14 lm W-1
Device structure ITO (50 nm)/NPD (40 nm)/TCTA (15 nm)/mCP) (15 nm)/1 wt% DABNA-2*:mCBP(20 nm)/TSPO1 (40 nm)/LiF (1 nm)/Al (100 nm) [7]
Colour Blue blue
Max. Current Efficiency 21.1 cd/A
Max. EQE 20.2%
Max. Power Efficiency 15.1 lm W1
Device structure ITO (50 nm)/NPD (40 nm)/TCTA (15 nm)/mCP) (15 nm)/1 wt% DABNA-2*:mCBP(20 nm)/TSPO1 (40 nm)/LiF (1 nm)/Al (100 nm) [8]
Colour Yellow yellow
Max. Current Efficiency 66.2 cd/A
Max. EQE 23.2%
Max. Power Efficiency 56.2 lm W1
Device structure ITO (120 nm)/PEDOT:PSS (60 nm)/TAPC (10 nm)/TCTA (10 nm)/mCP (10 nm)/DPEPO:DMAC-DPS:TBRb (25 nm)/TSPO1 (5 nm)/TPBI (30 nm)/LiF (1 nm)/Al (200 nm) [9]
Colour White white
Max Current Efficiency 39.3 cd/A 
Max EQE 17.6%
Max. Power Efficiency 41.0 lm W-1

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


Grade Order Code Quantity Price
Sublimed (>99% purity) M2199A1 100 mg £199.00
Sublimed (>99% purity) M2199A1 250 mg £399.00
Sublimed (>99% purity) M2199A1 500 mg £678.00
Sublimed (>99% purity) M2199A1 1 g £1130.00

MSDS Documentation


Literature and Reviews

  1. Arylsilanes and siloxanes as optoelectronic materials for organic light-emitting diodes (OLEDs), D. Sun et al., J. Mater. Chem. C, 3, 9496 (2015); DOI: 10.1039/c5tc01638j.
  2. δ-Carboline-based bipolar host materials for deep blue thermally activated delayed fluorescence OLEDs with high efficiency and low roll-off characteristic, J. Moon et al., RSC Adv., 8, 17025 (2018); DOI: 10.1039/c8ra01761a.
  3. Suppressing Efficiency Roll-Off of TADF Based OLEDs by Constructing Emitting Layer With Dual Delayed Fluorescence, Y. Zhang et al., Front. Chem., 7, 302 (2019); doi: 10.3389/fchem.2019.00302.
  4. Design Strategy for 25% External Quantum Effi ciency in Green and Blue Thermally Activated Delayed Fluorescent Devices, D. Lee et al., Adv. Mater. 2015, 27, 5861–5867 (2015); DOI: 10.1002/adma.201502053.
  5. High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility, Y-J. Cho et al., Adv. Mater., 26, 6642–6646 (2014); DOI: 10.1002/adma.201402188.
  6. Highly luminescent palladium(II) complexes with sub-millisecond blue to green phosphorescent excited states. Photocatalysis and highly efficient PSF-OLEDs, P-K. Chow et al., Chem. Sci., 7, 6083-6098 (2016); DOI: 10.1039/C6SC00462H.
  7. High efficiency (~ 100 lm W-1) hybrid WOLEDs by simply introducing ultrathin non-doped phosphorescent emitters in a blue exciplex host, S, Ying et al., J. Mater. Chem. C, 6, 7070 (2018); DOI: 10.1039/c8tc01736k.
  8. Aromatic-Imide-Based Thermally Activated Delayed Fluorescence Materials for Highly Efficient Organic Light-Emitting Diodes, M. Li et al., Angew. Chem. Int. Ed., 56, 8818 –8822 (2017); DOI: 10.1002/anie.201704435.
  9. High efficiency fluorescent white organic light-emitting diodes having a yellow fluorescent emitter sensitized by a blue thermally activated delayed fluorescent emitter, W. Song et al., Org. Electron., 23, 138–143 (2015); doi: 10.1016/j.orgel.2015.04.016.
  10. External Quantum Efficiency Above 20% in Deep Blue Phosphorescent Organic Light‐Emitting Diodes, S. Jeon et al., adv. mater., 23, 1436 (2011); DOI: 10.1002/adma.201004372.

To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.