Bepp2

Bepp2, blue fluorescence emitter with excellent charge transport ability

ETL and HBL material used in high efficiency OLEDs

Bis[2-(2-hydroxyphenyl)-pyridine] beryllium, known as Bepp2, belonging to the beryllium complex family, is a blue fluorescence emitter with excellent charge transport ability. Due to its high electron mobility and high triplet energy level, Bepp2 has been used as an electron-transporting and hole/exciton-blocking layer material in OLEDs. High-efficiency blue OLEDs by using Bepp2 as the emitting layer material and high efficiency white OLEDs using Bepp2 as host material have been achieved [1-8].

Bepp2 can be also used as host material to fabricate orange, green, red EL devices.

General Information

* Measurable with an optical spectrometer, see our spectrometer application notes.

Product Details

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

Chemical Structure

Device Structure(s)

Device structure	ITO/NPB (60 nm)/Bepp2 (50 nm)/LiF (1 nm)/Al (200 nm) [1]
Colour	Blue
Max. Luminance	15, 000 cd/m2
Max. Current Efficiency	3.8 cd/A
Max. Power Efficiency	3.43 lm W−1

Device structure	ITO/Cu-Pc(10 nm)/TPD(50 nm)/Bepp2 (40 nm)/LiF(1.5 nm)/Al(200 nm) [2]
Colour	Blue
Max. Luminance	4,000 cd/m2
Max. Power Efficiency	0.55 lm W−1

Device structure	ITO/NPB (30 nm)/(bzq)2Ir(dipba):Bepp2 (20 nm)/Bepp2 (35 nm)/LiF (0.5 nm)/Al [3]
Colour	White
Max. EQE	27.8%
Max. Current Efficiency	60.8 cd/A
Max. Power Efficiency	48.8 lm W−1

Device structure	ITO/TPD (50 nm)/BePP2 (5 nm)/TPD (4 nm)/BePP2:rubrene (5 nm)/TPD (4 nm)/Alq (10 nm)/Al [4]
Colour	White
Max. Luminance	20,000 cd/m2
Max. Power Efficiency	1.11 lm W−1

Device structure	ITO/NPB (40 nm)/TCTA:Ir(ppy)3 (15 nm), 12 wt%/Bepp2:Ir(ppy)3 (15 nm), 12 wt%/LiF (1 nm)/Al (100 nm) [6]
Colour	Green
Max. EQE	18.6%
Max. Current Efficiency	58.7 cd/A
Max. Power Efficiency	65.1 lm W−1

Device structure	ITO/DNTPD (40 nm)/Bepp2:Ir(ppy)3 (50 nm), 15 wt%/LiF (0.5 nm)/Al (100 nm) [7]
Colour	Green
Max. Current Efficiency	38.3 cd/A
Max. Power Efficiency	46.4 lm W−1

MSDS Documentation

Bepp2 MSDS sheet

Literature and Reviews

1. High-performance blue electroluminescent devices based on hydroxyphenyl-pyridine beryllium complex, Y Liu, et al., Appl. Phys. Lett., 78, 2300 (2001); doi: 10.1063/1.1366338.
2. Hydroxyphenyl-pyridine Beryllium Complex (Bepp2) as a Blue Electroluminescent Material, Y. Li et al., Chem. Mater., 12, 2672–2675 (2000); DOI: 10.1021/cm000237u.
3. Highly efficient white organic electroluminescence device based on a phosphorescent orange material doped in a blue host emitter, T. Peng et al., J. Mater. Chem., 21, 3551-3553 (2011); DOI: 10.1039/C0JM03645E.