廖良生教授课题组
FUNSOM
导师语录


1.现代社会竞争激烈,因此,每个学生一定要提高自我核心竞争力;



2.每个学生要努力践行

“养天地正气,法古今完人“的苏大校训,力求将自己培养成德才兼备的现代青年;



3.我们要努力创造OLED技术的自主知识产权,在我国形成“养土鸡--喂土饲料--生土鸡蛋”的全自主产业链发展模式;



4.学术报告中所使用的PPT演示文稿,是报告人的学术面容。我们一定要认真学会如何作学术报告、如何准备高质量的演示文稿,为今后的事业发展,不断提高学术交流能力;




5.想问题时,要异想天开;做事情时,要脚踏实地。





26.Y.K.Wang, Q.Sun, S.F.Wu, Y.Yuan, Q.Li, Z.Q.Jiang, M.K.Fung and L.S.Liao, Adv.Funct.Materials,2016
浏览数:17

Thermally Activated Delayed Fluorescence Material as Host with Novel Spiro-Based Skeleton for High Power Efficiency and Low Roll-Off Blue and White Phosphorescent Devices


Efficiency roll-off in blue organic light-emitting diodes especially at high brightness still remains a vital issue for which the excitons density-dependent mechanism of host materials takes most responsibility. Additionally, the efficiency roll-off leads to high power consumption and reduces the operating lifetime because higher driving voltage and current are required. Here, by subtly modifying the triphenylamine to oxygen-bridged quasi-planar structure, a novel thermally activated delayed fluorescence type blue host Tri-o-2PO is successfully developed. Efficiency roll-off based on Tri-o-2PO is ultralow with external quantum efficiency (EQE) just dropping by around 2% in the high luminance range from 1000 cd m−2 to 10 000 cd m−2. As expected, low turn-on voltage (≈2.9 V) of device is also achieved, which is close to the theory limit value (≈2.62 V). Super-high power efficiency (≈60 lm W−1) and EQE (>22%) are also achieved when utilizing Tri-o-2PO as host. Furthermore, two-color warm-white light with CIE of (0.45, 0.43) and correlated color temperature of 2921 K is also fabricated and a champion EQE of 21% is delivered. These excellent performances prove the strategy of bridging the triphenylamine to reduce ΔEst is validated and suggest the great potential of this novel skeleton.