Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer
Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer
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DOI：
10.1063/1.1852707
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发表时间：
2005-01
影响因子：
4
通讯作者：
Takahito Oyamada;H. Sasabe;C. Adachi;Seiichiro Murase;T. Tominaga;C. Maeda
中科院分区：
文献类型：
--
作者：
Takahito Oyamada;H. Sasabe;C. Adachi;Seiichiro Murase;T. Tominaga;C. Maeda
我们使用由 Cs 和苯基二芘基氧化膦 (POPy2) 共沉积层组成的电子传输层 (ETL) 展示了有机发光二极管中的高效电子注入和传输。特别是，由原子摩尔比为1:2的Cs:POPy2层组成的ETL表现出极低的驱动电压，在仅3.9V的施加电压下产生100mA/cm2的高电流密度。开尔文探针和吸收测量的结果表明，在Cs:POPy2/Al阴极界面处形成CsAl合金层以及Cs和POPy2之间的电荷转移络合物有助于提高效率。分别是电子注入和传输。
We demonstrated efficient electron injection and transport in organic light-emitting diodes using an electron-transport layer (ETL) composed of a Cs and phenyldipyrenylphosphine oxide (POPy2) co-deposited layer. In particular, an ETL composed of a Cs:POPy2 layer with an atom:molar ratio of 1:2 demonstrated an extremely low driving voltage, resulting in a high current density of 100mA∕cm2 at an applied voltage of only 3.9 V. The results of Kelvin probe and absorption measurements indicated that the formation of a CsAl alloy layer at the Cs:POPy2/Al cathode interface and the charge-transfer complex between the Cs and POPy2 contributed to enhancing the efficiency of electron injection and transport, respectively.