Suppression of roll-off characteristics of electroluminescence at high current densities in organic light emitting diodes by introducing reduced carrier injection barriers
Suppression of roll-off characteristics of electroluminescence at high current densities in organic light emitting diodes by introducing reduced carrier injection barriers
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DOI：
10.1063/1.3488883
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发表时间：
2010-09-15
影响因子：
3.2
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Setoguchi, Yousuke;Adachi, Chihaya
实验研究了在高电流密度下抑制有机电致发光二极管（OLED）电致发光效率的滚降特性。为了增加激子密度，我们提出了一种非异质结构OLED，其由4，4 '-双[（N-咔唑）苯乙烯基]联苯（BSB-Cz）的单个发光层和在阴极侧和阳极侧局部掺杂施主/受主的层组成。OLED在100 A/cm（2）以上的高电流密度下表现出对滚降特性的抑制，具有平衡的双极注入和输运，导致10（24）cm（-3）s（-1）的高激子密度。此外，通过光泵浦单层器件，获得了具有相对低的阈值E（th）=24 μ J/cm（2）的放大自发辐射。然而，为了实现电激励，有必要将激光阈值降低两个数量级或注入100倍更高的电流密度。(C)2010年美国物理学会。[doi：10.1063/1.3488883]
We experimentally investigated suppression of the roll-off characteristics of the electroluminescence efficiency at high current densities in organic light emitting diodes (OLEDs). To increase exciton density, we propose a nonheterostructure OLED that consists of a single emitting layer of 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) and layers locally with doped donors/acceptors on the cathode and anode sides. The OLED exhibited suppression of the roll-off characteristics at high current densities over 100 A/cm(2) with balanced bipolar injection and transport, resulting in the high exciton density of 10(24) cm(-3) s(-1). Furthermore, amplified spontaneous emission with a relatively low threshold of E(th)=24 mu J/cm(2) was obtained by optically pumping the single-layer device. However, to realize electrical excitation it was necessary to reduce the lasing threshold by two orders of magnitude or to inject a 100 times higher current density. (C) 2010 American Institute of Physics. [doi:10.1063/1.3488883]