Highly efficient polarized polymer light-emitting diodes utilizing oriented films of β-phase poly(9,9-dioctylfluorene)
Highly efficient polarized polymer light-emitting diodes utilizing oriented films of β-phase poly(9,9-dioctylfluorene)
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DOI：
10.1063/1.2959073
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发表时间：
2008-07
影响因子：
4
通讯作者：
M. Misaki;M. Chikamatsu;Y. Yoshida;R. Azumi;N. Tanigaki;K. Yase;Shuichi Nagamatsu;Y. Ueda
中科院分区：
文献类型：
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作者：
M. Misaki;M. Chikamatsu;Y. Yoshida;R. Azumi;N. Tanigaki;K. Yase;Shuichi Nagamatsu;Y. Ueda
采用摩擦转移法制备了β相聚（9，9-二辛基芴）（PFO）单轴取向薄膜，并对其进行了热退火和气相处理。吸收光谱和光致发光（PL）谱显示了β相的特征：在433 nm处有一个额外的吸收峰，PL峰相对于通常的β（N）相有红移。我们利用β相PFO的取向膜制备了偏振聚合物发光二极管。从器件中观察到积分偏振比为51的高偏振β相发射。基于β相的器件效率达到2.0cd scinA，比基于N相的器件效率提高了2倍。
Uniaxially oriented films of β-phase poly(9,9-dioctylfluorene) (PFO) were realized by a friction-transfer technique followed by thermal annealing and vapor treatments. Absorption and photoluminescence (PL) spectra show the characteristics of β-phase: an additional absorption peak at 433nm and redshifted PL peaks compared with those of the usual nematic (N) phase. We fabricated polarized polymer light-emitting diodes utilizing oriented films of β-phase PFO. Highly polarized β-phase emission with an integrated polarization ratio of 51 was observed from the devices. The efficiency of the devices based on β-phase reached 2.0cd∕A, which is two times higher than that based on N-phase.