SiTrzCz2, 9,9′-(6-(3-(triphenylsilyl)phenyl)-1,3,5-triazine-2,4-diyl)bis(9H-carbazole), has a molecular structure of two electron rich carbzolyl and one tetraphenylsilane units that are bridged by a electron deficient 1,3,5-trazine. SiTrzCz2 is electron deficient so it is normally used as electron transport layer, or as a blue bipolar phosphorescent host, or as one of the electron accepting components in a binary exciplex host.

Exciplex host SiCzCz:SiTrZCz2 has a triplet energy level that is lower than those of single host materials but still high enough to allow the exciplex to be used as a co-host in blue phosphorescent organic light-emitting diodes (PhOLEDs). Also device using mCBP:SiTrZCz2 (mSi-2CzTrz) as exciplex host demonstrated an external quantum efficiency of 22.8% and a operational lifetime with up to 80% of the initial luminance of over 2000 h at 100 cd m−2 in blue PhOLEDs [1].

General Information

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CAS number	2422045-58-5
Chemical formula	C51H35N5Si
Molecular weight	745.94 g/mol
Photoluminescence	λem 440 nm (in film)
HOMO/LUMO	HOMO = 5.99 eV, LUMO = 2.75 eV; ET = 2.89 eV [1]
Chemical name	9,9′-(6-(3-(triphenylsilyl)phenyl)-1,3,5-triazine-2,4-diyl)bis(9H-carbazole)
Synonyms	mSi-2CzTrz
Classification / Family	Arylsilane derivatives, Phosphorescent host materials, Hole transport layer (HTL), Electron blocking layer (EBL), Sublimed materials, Semiconducting small molecules

Product Details

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Purity	Sublimed* >99.0% (HPLC)
Melting point	Tg = 125 °C, TGA = 487 °C (lit.)
Appearance	White powder/crystals

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

Chemical Structure

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Chemical structure of 9,9′-(6-(3-(triphenylsilyl)phenyl)-1,3,5-triazine-2,4-diyl)bis(9H-carbazole) (SiTrzCz2), CAS 2422045-58-5