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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/27483

Title: Hole Mobilities of 2,7- and 2,2'-Disubstituted 9,9'-Spirobifluorene-Based Triaryldiamines and Their Application as Hole Transport Materials in OLEDs
Authors: Yuan-Li Liao;Wen-Yi Hung;Tei-Hung Hou;Chi-Yen Lin;Ken-Tsung Wong
Contributors: NTOU:Institute of Optoelectronic Sciences
Date: 2007-12-11
Issue Date: 2011-10-21T02:31:56Z
Publisher: Chemistry of Materials
Abstract: Abstract:Hole mobilities of up to 2 × 10−3 cm2 V−1 s−1 of 2,7- and 2,2′-disubstituted spirobifluorene-based triaryldiamine derivatives have been measured using time-of-flight (TOF) techniques. Among these derivatives, 27DPSF (possessing diphenylamino groups attached onto the same biphenyl branch of spirobifluorene) and 22DPASF (possessing extended π-conjugation of the chromophore) exhibited the highest hole mobilities because of their greater intermolecular interactions. The charge transport parameters were extracted, using a Gaussian disorder model (GDM), from detailed temperature- and field-dependent hole mobility measurements. For 2,2′-disubstituted systems possessing different diarylamino groups, the hole mobilities decreased in the order 22DPSF > 22DTSF > 22DBPSF, indicating that spatial hindrance had a crucial effect on the hole transport behavior. To verify these disubstituted spirobifluorene-based amines can be used as HTLs in OLED devices. A standard device was fabricated with the configuration ITO/m-MTDATA (20 nm)/triaryldiamine derivative (40 nm)/Alq3 (60 nm)/LiF (0.5 nm)/Al (150 nm), which gave a relatively high current density (ca. 5200 mA/cm2), impressive maximum brightness (1.3 × 105 cd/m2), and high external quantum efficiency (1.8%). The device performances are strongly correlated to the charge transporting behavior of such disubstituted spirobifluorene-based amines.
Relation: 19(25), pp.6350-6357
URI: http://ntour.ntou.edu.tw/handle/987654321/27483
Appears in Collections:[光電科學研究所] 期刊論文

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