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Bis[2-(2-hydroxyphenyl)pyridine]beryllium, also known as Bepp2, is a hydroxyphenylpyridine beryllium complex[1]. Bepp2 has photoluminescence and electroluminescence properties. Its fluorescence emission peak is approximately 450 nm (blue light) and has a high fluorescence intensity[2]. Bepp 2 can be used as an emitting material for the manufacture of blue light electroluminescent devices, and can also be used as a host material to fabricate orange-red EL devices.

Blue OLED dopant material.

[1] Li Y, et al. Hydroxyphenyl-pyridine Beryllium Complex (Bepp2) as a Blue Electroluminescent Material. Can J Physiol Pharmacol. 2000, 12, 2672–2675.
[2] Miao Y, et al. Ultra-simple white organic light-emitting diodes employing only two complementary colors with color-rendering index beyond 90. RSC Advances. 2017, 7, 49769-49776.
[3] Liao Y, et al. TD-DFT study on electronic spectrum property for Bepp2 and its related complexes. Synthetic Metals. 2003, 137, 1093-1094..