Ethynylphenyl-Linked Carbazoles as a Single-Emitting Component for White Organic Light-Emitting Diodes
Source abstract
Abstract
A comparative photophysical study of several new dendrimers consisting of the ethynylphenyl core and carbazole dendrons ( 1 − 5 ) is presented. Dilute solutions of 1 − 5 show intense blue emission in dichloromethane (λ max = 410−438 nm, Φ F = 0.53−0.91, τ F = 2.09−3.91 ns). The solvatochromic and solid-state emission behavior of 1 − 5 (λ max = 426−443 nm, Φ F = 0.30−0.90) is discussed. The geometry of 5 allows formation of a strong electromeric state, which was not the case with 1, indicating that the ethynylphenyl group can be used to tune dendrimer electroluminescence (EL) properties. An organic light-emitting diode (OLED) consisting of 1 as the emitting layer showed blue emission (CIE: 0.28, 0.20), whereas the EL of 5 (CIE: 0.34, 0.36) was found to be close to ideal white light. White OLEDs consisting of 5 as the emitting layer showed a maximum brightness of 450 cd/m 2 and a maximum efficiency of 0.11 cd/A at 11 V.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
Department of Chemistry, Pittsburg State University, Pittsburg, Kansas 66762
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