Efficient red phosphorescent OLEDs employing carbazole-based materials as the emitting host

Autor:	R. Griniene, Chih-Hao Chang, Chia-Chi Yeh, Saulius Grigalevicius, Dmytro Volyniuk, Hao-Che Kao, Juozas V. Grazulevicius, Yu-De Su
Rok vydání:	2015
Předmět:	Photoluminescence Materials science Thin layers Carbazole Process Chemistry and Technology General Chemical Engineering Photochemistry Amorphous solid chemistry.chemical_compound chemistry OLED Ionization energy Phosphorescence Glass transition
Zdroj:	Dyes and Pigments. 122:257-263
ISSN:	0143-7208
DOI:	10.1016/j.dyepig.2015.06.038
Popis:	We report on the synthesis and characterization of a new series of electro-active carbazole-based compounds. The derivatives are thermally stable amorphous materials with glass transition temperatures in the range of 54–93 °C. Electron photoemission spectra of thin layers of the materials show ionization potential in the range of 5.4–5.5 eV. The carbazole-based derivatives are fully characterized and their spectroscopic properties are determined by absorption and photoluminescence. All developed materials and commonly-used tris(4-carbazoyl-9-ylphenyl)amine (TCTA) were used as hosts in red phosphorescent organic light-emitting diodes (OLEDs) for comparison. Results indicate that a device with 3-[bis(9-ethylcarbazol-3-yl)methyl]-9-hexylcarbazole exhibited superior performance with peak efficiencies of 8.4%, 5.3 cd/A and 5.5 lm/W.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::020dfa41e7c636e569093e3543d79857 https://doi.org/10.1016/j.dyepig.2015.06.038 Zobrazit plný text záznamu Full Text from ScienceDirect