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  (E_T ) 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 (E_LUMO = 2.52 eV) and HOMO (E_HOMO = 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

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
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
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
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
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
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
Max. Current Efficiency	21.1 cd/A
Max. EQE	20.2%
Max. Power Efficiency	15.1 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) [8]
Colour	Yellow
Max. Current Efficiency	66.2 cd/A
Max. EQE	23.2%
Max. Power Efficiency	56.2 lm W−1

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
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

Pricing

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

TSPO1 MSDS sheet

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.

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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.

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