B3PymPm is an isomer to B2PymPm and B4PymPm , with a 2-methylpyrimidine core structure with four pyridine pendants. It is electron-deficient ａnd can be used in OLED devices as an electron-transporting or hole-blocking layer material. B3PymPm is known to form hydrogen bonding in ａnd between molecules. The intermolecular ａnd intramolecular hydrogen bonding are believed to promote film morphology - hence enhancing charge mobility.
Due to its electron-deficient nature, together with TCTA , B3PymPm is also used in thermally activated delayed fluroescent (TADF) devices as an exciplex-forming co-host to fabricate highly-efficient fluorescent organic light-emitting diodes.
General Information CAS number 925425-96-3 Full name 4,6-Bis(3,5-di(pyridin-3-yl)phenyl)-2-methylpyrimidine, 4,6-Bis(3,5-di-3-pyridinylphenyl)-2-methylpyrimidine Chemical formula C37 H26 N6 Molecular weight 554.64 g/mol Absorption* λmax 248 nm in DCM Fluorescence n/a HOMO/LUMO HOMO = 6.97 eV, LUMO = 3.53 eV [1]; ET1 Classification / Family Pyrimidine derivatives, Highly efficient light-emitting diodes, Organic electronics, Electron-transport layer (ETL) materials, Hole-blocking layer (HBL) materials, Sublimed materials.
* Measurable with an optical spectrometer , see our spectrometer application notes .
Product Details Purity Sublimed >99.0% (HPLC), unsublimed >98.0% Melting point 326 °C Appearance White crystals/powder
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials .
Chemical Structure Chemical structure of B3PymPm Device Structure(s) Device structure ITO/15 wt.% Rb2 CO3 :B3PymPm (20 nm)/B3PymPm (30 nm)/8 wt.% Ir(ppy)3 :CBP (15 nm)/TAPC (30 nm)/8 wt.% ReO3 :TAPC (20 nm)/Al [2] Colour Green Max. Power Efficiency 79.8 lm W−1 Max. EQE 19.8%
Device structure ITO (150 nm)/TAPC (20 nm)/TCTA (10 nm)/TCTA:B3PYMPM :Ir(mphq)2 (acac) (5 nm, 3 wt%)/TCTA:B3PYMPM :Ir(ppy)2 (acac) (25 nm, 8 wt%)/B3PYMPM (45 nm)/LiF (0.7 nm)/Al (100 nm) [3] Colour Orange Max. Power Efficiency 70.1 lm W−1 Max. EQE 22.8%
Device structure ITO (70 nm)/ TAPC (75 nm)/TCTA (10 nm)/TCTA:B3PYMPM :4 wt % Ir(dmppy-pro)2 tmd* (30 nm)/B3PYMPM (45 nm)/LiF (0.7 nm)/Al (100 nm) [4] Colour Green Max. Current Efficiency 126 cd/A Max. EQE 36.0%
Device structure ITO (70 nm)/ TAPC (75 nm)/TCTA (10 nm)/TCTA:B3PYMPM :4 wt % Ir(dmppy-ph)2 tmd* (30 nm)/B3PYMPM (55 nm)/LiF (0.7 nm)/Al (100 nm) [4] Colour Yellow Max. Current Efficiency 108 cd/A Max. EQE 38.1%
Device structure ITO (70 nm)/TAPC ( 80 nm)/TCTA (10 nm)/TCTA:B3PYMPM :8 wt% Ir(ppy)2 (acac) B3PYMPM (40 nm)/Al (100 nm) [5] Colour Green Max. Current Efficiency 127.3 lm W−1 Max. EQE 30.2%
Device structure ITO (70 nm)/TAPC (75 nm)/TCTA (10 nm)/TCTA:B3PYMPM :8.4 mol% Ir(ppy)2 tmd* (30 nm)/B3PYMPM (45 nm)/LiF (0.7 nm)/Al (100 nm) [6] Colour Green Max. Current Efficiency 142.5 lm W−1 Max. EQE 32.3%
*For chemical structure information, please refer to the cited references
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