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中国科学院半导体研究所半导体材料科学重点实验室 北京,100083
纸质出版日期:2015-6-3,
收稿日期:2015-3-18,
修回日期:2015-4-19,
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牛立涛, 关敏, 楚新波等. 有机电致发光器件的瞬态电响应特性[J]. 发光学报, 2015,36(6): 699-704
NIU Li-tao, GUAN Min, CHU Xin-bo etc. Transient Current Response Characteristics of Organic Light-emitting Diodes[J]. Chinese Journal of Luminescence, 2015,36(6): 699-704
牛立涛, 关敏, 楚新波等. 有机电致发光器件的瞬态电响应特性[J]. 发光学报, 2015,36(6): 699-704 DOI: 10.3788/fgxb20153606.0699.
NIU Li-tao, GUAN Min, CHU Xin-bo etc. Transient Current Response Characteristics of Organic Light-emitting Diodes[J]. Chinese Journal of Luminescence, 2015,36(6): 699-704 DOI: 10.3788/fgxb20153606.0699.
详细研究了有机发光二极管(OLED)在脉冲电压下的瞬态电流响应特性。瞬态响应电流由3部分组成:正向电流峰(I
P
)、稳态电流(I
S
)及反向电流峰(I
N
)。研究发现I
S
为器件工作时通过器件的电流
而I
N
与I
P
则分别对应OLED器件电极/有机界面附近的空间电荷的形成及消失过程。I
N
、I
P
与脉冲电压成线性关系
阳极的费米能级与空穴传输材料的HOMO能级差导致I
N
大于I
P
。利用不同占空比的双脉冲电压研究了电流与空间电荷的关系
发现空间电荷的充分放电临界占空比只受界面接触的影响
而与器件内部结构无关。
Detailed transient current response characteristics of organic light-emitting diode (OLED) were investigated. Transient current response curve can be divided into three partitions: positive current spike (I
P
)
stead-state current (I
S
) and negative current spike (I
N
). It is found that the positive and negative current peaks correspond to the charging and discharging process of space charges near electrode/organic interface
respectively. Linear relationship between the current spikes and pulsed voltage amplitude is found. Larger I
N
than I
P
is induced by the difference between Femi level of electrode and the highest occupied orbital level (HOMO) of organic materials. Different duty-ration dual pulsed voltages are modulated to investigate the relation between current response and space charges. It is found the space charge charging and discharging threshold duty-ration is only depended on the hole injection barrier and independent with internal device structure.
有机发光二极管瞬态电流响应界面空间电荷
organic light-emitting diodetransient current responseinterfacespace charges
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