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First Example of White Organic Electroluminescence Utilizing Perylene Ester Imides
Author(s) -
Gupta Ravindra K.,
Das Dipjyoti,
Iyer Parameswar K.,
Achalkumar Ammathnadu S.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801258
Subject(s) - electroluminescence , perylene , materials science , optoelectronics , oled , layer (electronics) , brightness , diode , chemistry , nanotechnology , molecule , optics , organic chemistry , physics
Utilizing a series of bay ‐annulated perylene ester imides (PEIs) doped in polyvinylcarbzole (PVK) as emissive layer, host‐guest organic light emitting diodes were fabricated and the electroluminescence behaviors of these devices have been explored. The devices exhibited emission from both PVK as well as PEI mainly due to the partial Förster resonance energy transfer from PVK to the emissive dopant. In order to achieve better device performance, two different electron transport layers, BPhen and TPBi were used. A remarkable improvement in the emission brightness and lower turn on voltage was observed, when TPBi was used as an electron‐transporting layer instead of BPhen. Incorporation of TPBi resulted in a lower electron injection barrier of TPBi‐PVK interface, which facilitates more electron injection into the emissive layer thus resulting in an increased recombination at a comparatively lower voltage. Also, the intensity of blue emission from PVK was enhanced in the case of TPBi based devices, resulting in an overall white electroluminescence, which is of high technological importance.