SPPO1

CAS Number 1125547-88-7

Electron Transport Layer Materials, High Purity Sublimed Materials, Materials, OLED Materials, Semiconducting Molecules, TADF Materials

MSDS

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	λ_max 317 nm (dichloromethane)
Photoluminescence	λ_em 347 nm (dichloromethane)
HOMO/LUMO	HOMO = 6.5 eV, LUMO = 2.8 eV; E_T = 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	T_g= 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

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
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
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
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
Max. Luminance	18,330cd/m²
Max. EQE	12.9%
Max. Current Efficiency	30.3 cd/A
Max. Power Efficiency	30.0 lm/W

Pricing

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

SPPO1 MSDS sheet

Literature and Reviews

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.
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.
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.

Solution Processed Blue Phosphorescent Organic Light Emitting Diodes Using a Phosphine Oxide Host Material, K. Yook et al., Electrochem. Solid-State Lett., 13 (6) J71-J73 (2010); DOI: 10.1149/1.3367630.
Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle, S. Ming et al., Chin. Phys. B 21 (10), 108507 (2012); DOI: 10.1088/1674-1056/21/10/108507.
An Amorphous Spirobifluorene-Phosphine-Oxide Compound as the Balanced n-Type Host in Bright and Efficient Light-Emitting Electrochemical Cells with Improved Stability, S. Tang, et al., Adv. Optical Mater., 9, 2002105 (2021); DOI: 10.1002/adom.202002105.