Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices
Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices
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DOI：
10.1063/1.1594834
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发表时间：
2003-07-21
影响因子：
4
通讯作者：
Sato, F
中科院分区：
文献类型：
--
作者：
Tokito, S;Iijima, T;Sato, F
我们已经在基于铱（III）双[（4，6-二氟苯基）-吡啶-N，C2 ']吡啶甲酸酯（FIrpic）的有机发光器件（OLED）中显著提高了发光效率。为了提高效率，使用具有高三重态能量的4，4 ′-双（9-咔唑基）-2，2 ′-二甲基-联苯作为发光层的载流子传输主体。基于FIrpic的OLED表现出10.4%的最大外量子效率，对应于20.4cd/A的电流效率，以及10.5lm/W的最大功率效率。与先前报道的基于FIrpic的OLED的效率相比，效率显著提高。该结果表明，三重态能量被有效地限制在FIrpic分子上，导致高效率。(C)2003年，美国物理学会。
We have significantly improved the emission efficiency in an organic light-emitting device (OLED) based on iridium (III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2']picolinate (FIrpic). To improve the efficiency, 4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl, which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The FIrpic-based OLED exhibited a maximum external quantum efficiency of 10.4%, corresponding to a current efficiency of 20.4 cd/A, and a maximum power efficiency of 10.5 lm/W. The efficiency was drastically improved compared to that of a previously reported FIrpic-based OLED. This result indicates that triplet energy is efficiently confined on FIrpic molecules, resulting in the high efficiency. (C) 2003 American Institute of Physics.