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.

---

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.

About Ossila Founded in 2009 by organic electronics research scientists, Ossila aims to provide the components, equipment, and materials to enable intelligent and efficient scientific research and discovery. Over a decade on, we're proud to supply our products to over 1000 different institutions in over 80 countries globally. With decades of academic and industrial experience in developing organic and thin-film LEDs, photovoltaics, and FETs, we know how long it takes to establish a reliable and efficient device fabrication and testing process. As such, we have developed coherent packages of products and services - enabling researchers to jump-start their organic electronics development program. The Ossila Guarantee Free Worldwide Shipping Eligible orders ship free to anywhere in the world Fast Secure Dispatch Rapid dispatch on in-stock items via secure tracked courier services Quality Assured Backed up by our free two year warranty on all equipment Clear Upfront Pricing Clear pricing in over 30 currencies with no hidden costs Large Order Discounts Save 8% on orders over $10,300.00 and 10% on orders over $12,900.00 Expert Support Our in-house scientists and engineers are always ready to help Trusted Worldwide Great products and service. Have already recommended to many people. Dr. Gregory Welch, University of Calgary Wonderful company with reasonably priced products and so customer-friendly! Shahriar Anwar, Arizona State University The Ossila Team Prof. David Lidzey - Chairman As professor of physics at the University of Sheffield, Prof. David Lidzey heads the university’s Electronic and Photonic Molecular Materials research group (EPMM). During his career, David has worked in both academic and technical environments, with his main areas of research including hybrid organic-inorganic semiconductor materials and devices, organic photonic devices and structures and solution processed photovoltaic devices. Throughout his academic career, he has authored over 220 peer-reviewed papers. Dr. James Kingsley - Managing Director James is a co-founder and managing director of Ossila. With a PhD in quantum mechanics/nanotech and over 12 years’ experience in organic electronics, his work on the fabrication throughput of organic photovoltaics led to the formation of Ossila and the establishment of a strong guiding ethos: to speed up the pace of scientific discovery. James is particularly interested in developing innovative equipment and improving the accessibility of new materials for solution-processable photovoltaics and hybrid organic-inorganic devices. Dr. Alastair Buckley - Technical Director Alastair is a lecturer of Physics at the University of Sheffield, specialising in organic electronics and photonics. He is also a member of the EPMM research group with a focus on understanding and applying the intrinsic advantages of functional organic materials to a range of optoelectronic devices. Alastair’s experience has not been gained solely in academia; he previously led the R&D team at MicroEmissive Displays and therefore has extensive technical experience in OLED displays. He is also the editor and contributor of "Organic Light-Emitting Diodes" by Elsevier. Our Research Scientists Our research scientists and product developers have significant experience in the synthesis and processing of materials and the fabrication and testing of devices. The vision behind Ossila is to share this experience with academic and industrial researchers alike, and to make their research more efficient. By providing products and services that take the hard work out of the device fabrication process, and the equipment to enable accurate, rapid testing, we can free scientists to focus on what they do best - science. Customer Care Team The customer care team is responsible for the customer journey at Ossila. From creating and providing quotes, through to procurement and inventory management, the customer care team is devoted to providing first class customer service. The general day to day responsibilities of a customer care team member involves processing customers orders and price queries, answering customer enquiries, arranging the shipment of parcels and notifying customers of updates on their orders. Collaborations and Partnerships Please contact the customer care team for all enquires, including technical questions about Ossila products or for advice on fabrication and measurement processes. Location and Facilities Ossila is based at the Solpro Business Park in Attercliffe, Sheffield. We operate a purpose-built synthetic chemistry and device testing laboratory on site, where all of our high-purity, batch-specific polymers and other formulations are made. This is complemented by a dedicated suite of thin-film and organic electronics testing and analysis tools within the device fabrication cluster housed in a class 1000 cleanroom in the EPSRC National Epitaxy Facility in Sheffield. All our electronic equipment is manufactured on-site.