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Citation: ZHANG Long, LIN Zong-Qiong, GU Ju-Fen, YIN Cheng-Rong, HOU Xiao-Ya, LIU Feng, LIU Yu-Yu, XIE Ling-Hai, CHEN Shu-Fen, HUANG Wei. Synthesis and Spectral Stability of Blue Eletroluminescent Fluorene-Substituted Polyfluorenes[J]. Acta Physico-Chimica Sinica, ;2010, 26(07): 1934-1940. doi: 10.3866/PKU.WHXB20100739 shu

Synthesis and Spectral Stability of Blue Eletroluminescent Fluorene-Substituted Polyfluorenes

1.
Laboratory for Organic Electronics and Information Displays, Nanjing 210046, P. R. China
Institute of Advanced Materials, Nanjing University of Posts and Telecommunication, Nanjing 210046, P. R. China

Received Date: 4 February 2010
Available Online: 9 June 2010

A monomer of diarylfluorene containing triphenylamine and dialkylfluorene groups at the 9-position and its copolymers, TPAFF-co-F and TPAFF-co-P, were successfully synthesized by a Suzuki cross-coupling polycondensation to obtain stable and highly efficient blue light-emitting polymers. The dialkylfluorenes on the polyfluorene chain served as an antioxidant function as well as a shielding effect. Triphenylamine groups are favorable for hole-injection at the ITO/emitting-layer interface. The combination impart od thermal, morphological and spectral stabilities. Annealing experiments for 24 h in air at 200 ℃show that the sequence of green indexes (Igreen/Iblue) decreases as follows: poly(9,9-dioctylfluorene) (1.07)>TPAFF-co-F(0.65) >TPAFF-co-P (0.47). These results indicate that dialkylfluorene plays a role in the antioxidant function. Devices were fabricated with the following configuration: ITO/PEDOT:PSS(40 nm)/TPAFF-co-F or TPAFF-co-P(80 nm)/Ba(4 nm)/Al (120 nm). Preliminary results confirmed that they have stable electroluminescent spectra with Commission Internationale d'Eclairage (CIE) coordinates of (0.22, 0.24) at a current density of 547 mA·cm-2 for TPAFF-co-F and a CIE of (0.24, 0.26) for TPAFF-co-P with a maximumcurrent efficiency of 0.712 cd·A-1.
- Polyfluorene,
- Diarylfluorene,
- Low-energy emission band,
- Electroluminescence,
- Polymer blue light-emitting devices
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

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