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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41261

Title: Ambipolar Phosphine Derivatives to Attain True Blue OLEDs with 6.5%EQE
Authors: Ilya Kondrasenko;Zheng-Hua Tsai;Kun-you Chung;Yi-Ting Chen;Yana Yu Ershova;Antonio Doménech-Carbó;Wen-Yi Hung;Pi-Tai Chou;Antti J. Karttunen;Igor O. Koshevoy
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2016
Issue Date: 2017-02-13T03:26:16Z
Publisher: ACS Applied Material Interfaces
Abstract: Abstract: 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.
Relation: 8(17)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41261
Appears in Collections:[光電科學研究所] 期刊論文

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