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Synthesis and optical properties of hyperbranched polyarylenes and linear polyacetylenes
Author(s) -
Xie Zhiliang,
Peng Han,
Lam Jacky W.Y.,
Chen Jumwu,
Zheng Yonghua,
Qiu Chengfeng,
Kwok Hoi Sing,
Tang Ben Zhong
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390119
Subject(s) - electroluminescence , materials science , limiting , polymer , photochemistry , quantum efficiency , metathesis , optoelectronics , polymer chemistry , chemistry , polymerization , nanotechnology , mechanical engineering , layer (electronics) , engineering , composite material
New hyperbranched polyarylenes (HPAs) and linear polyacetylenes (LPAs) containing chromophoric moieties were synthesized in high yields (up to 97%) by coablt‐ and tantalum‐catalyzed polycyclotrimerizations and tungsten‐catalyzed metathesis polymerizations, respectively. The polymers possessed high molecular weights ( M w up to 113 000 Da) and were completely soluble in common organic solvents. The HPAs emitted strong UV light of 400 nm in high quantum yields ( Φ F up to 0.98) and limited intense laser pulses, whose limiting threshold and signal suppress power were better than those of C 60 , a well‐known optical limiter. The electroluminescence (EL) devices of the LPAs emitted blue light of ∼460 nm and exhibited maximun brightness, current efficiency, and external quantum efficiency of 1118 cd/m 2 , 1.53 cd/A, and 0.85%, respectively.