Improving color stability of blue/orange complementary white OLEDs by using single-host double-emissive layer structure: Comprehensive experimental investigation into the device working mechanism
Improving color stability of blue/orange complementary white OLEDs by using single-host double-emissive layer structure: Comprehensive experimental investigation into the device working mechanism
复制标题
利用单主体双发射层结构提高蓝/橙互补白光OLED的颜色稳定性：对器件工作机制的综合实验研究
DOI：
10.1016/j.orgel.2012.04.015
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
Ma, Dongge
中科院分区：
文献类型：
--
作者：
Zhao, Yongbiao;Zhu, Liping;Chen, Jiangshan;Ma, Dongge
本文利用空穴型单基质双发光层结构，成功地提高了蓝/橙子色互补白色有机电致发光器件（OLED）的光谱稳定性。所展示的双发光层结构有效地抑制了空穴俘获橙子磷光体上的电子-空穴对的直接复合，从而通过控制激子复合区来减小电荷俘获对电致发光光谱稳定性的劣化影响。结果表明，白色发光是一个从基质到蓝色荧光粉再到橙子荧光粉的级联能量传递过程，受驱动条件的影响较小。因此，当电压从4V增加到9V时，白色OLED中的国际照明委员会坐标（CIE）的变化小于（±0.010，±0.007），这对应于亮度从200 cdm-2增加到约20，000 cdm-2。这优于共掺杂的单发射层器件的上级，共掺杂的单发射层器件在相同的驱动电压范围内显示出（±0.05，±0.02）的大得多的CIE变化。对激子复合过程进行了详细的分析，阐明了所制备的双层结构白色OLED的工作机理。
In this paper, we successfully improved the spectral stability in blue/orange complementary white organic light-emitting diodes (OLEDs) by utilizing hole-type single host double emissive layer structure. The demonstrated double emissive layer structure effectively suppresses the direct recombination of electron–hole pairs on the hole-trapping orange phosphor and thus reduces the deteriorated effect of charge trapping on electroluminescence spectrum stability by controlling exciton recombination zone. It is shown that the white light emission is a cascade energy transfer process from host to blue phosphor and then to orange phosphor, which seems to be less affected by the driving conditions. Thus, the change in Commission Internationale de L’Eclairage coordinates (CIE) in the white OLEDs is less than (±0.010, ±0.007) as the voltage increases from 4V to 9V, which correspond to the luminance increasing from 200cdm−2to about 20,000cdm−2. This is superior to that of co-doped single emissive layer devices, which show much larger CIEs variation of (±0.05, ±0.02) in the same driving voltage range. We gave detailed analysis on the exciton recombination processes and well elucidated the working mechanism of the fabricated double emissive layer structure white OLEDs.
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影响因子：
4
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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