Derivatives to Attain True Blue OLEDs with 6.5% EQE

Kondrasenko, I.; Zheng-Hua, T.; Kun-you, C.; Yi-Ting, C.; Ershova, Y.Y.; Antonio, D.; Wen-Yi, H.; Pi-Tai ChouAntti, J.K.; Koshevoy, I.O.

Авторы: Ilya Kondrasenko, Zheng-Hua Tsai, Kun-you Chung, Yi-Ting Chen, Ershova Yana Yu, Antonio Doménech-Carbó, Wen-Yi Hung, Pi-Tai ChouAntti J.Karttunen, Koshevoy Igor O.
Журнал: ACS applied materials & interfaces
Том: 8
Номер: 17
Год издания: 2016
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 10968
Последняя страница: 10976
DOI: 10.1021/acsami.6b01041
Аннотация: A family of new branched phosphine derivatives {Ph2N–(C6H4)n−}3P → E (E = O 1–3, n = 1–3; E = S 4–6, n = 1–3; E = Se 7–9, n = 1–3; E = AuC6F5 4–6, n = 1–3), which are the donor–acceptor type molecules, exhibit efficient deep blue room temperature fluorescence (λem = 403–483 nm in CH2Cl2 solution, λem = 400–469 nm in the solid state). Fine tuning the emission characteristics can be achieved varying the length of aromatic oligophenylene bridge −(C6H4)n–. The pyramidal geometry of central R3P → E fragment on the one hand disrupts π-conjugation between the branches to preserve blue luminescence and high triplet energy, while on the other hand provides amorphous materials to prevent excimer formation and fluorescence self-quenching. Hence, compounds 2, 3, 5, and 12 were used as emitters to fabricate nondoped and doped electroluminescent devices. The luminophore 2 (E = O, n = 2) demonstrates excellently balanced bipolar charge transport and good nondoped device performance with a maximum external quantum efficiency (EQEmax) of 3.3% at 250 cd/m2 and Commission International de L’Eclairage (CIE) coordinates of (0.15, 0.08). The doped device of 3 (E = O, n = 3) shows higher efficiency (EQEmax of 6.5, 6.0 at 100 cd/m2) and high color purity with CIE (0.15, 0.06) that matches the HDTV standard blue. The time-resolved electroluminescence measurement indicates that high efficiency of the device can be attributed to the triplet–triplet annihilation to enhance generation of singlet excitons.
Добавил в систему: Карасева Яна Юрьевна

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Derivatives to Attain True Blue OLEDs with 6.5% EQEстатья Исследовательская статья