Field-induced dissociation of electron-hole pairs in organic light emitting diodes monitored directly from bias-dependent magnetic resonance techniques
Field-induced dissociation of electron-hole pairs in organic light emitting diodes monitored directly from bias-dependent magnetic resonance techniques
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DOI：
10.1103/physrevmaterials.1.022601
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发表时间：
2017-07-24
影响因子：
3.4
通讯作者：
Matsuoka, Hidenobu
中科院分区：
文献类型：
--
作者：
Kanemoto, Katsuichi;Hatanaka, Shuto;Matsuoka, Hidenobu
通过同步光致发光和光电流检测磁共振（PLDMR 和 PCDMR）技术，研究了有机发光二极管（OLED）中电子-空穴（e-h）对向载流子和激子的转换过程，作为偏置的函数。随着场强的增加，PLDMR 和 PCDMR 信号都消失或极度减少，而光致发光强度不变，光电流反而增加。这是 e-h 对被场解离的明确证据。提出了一种简单的成对解离模型，并解释了 PLDMR 强度的场依赖性。
The conversion processes of electron-hole (e-h) pairs into carriers and excitons in organic light emitting diodes (OLEDs) have been explored by simultaneous photoluminescence-and photocurrent-detected magnetic resonance (PLDMR and PCDMR) techniques as a function of bias. Both PLDMR and PCDMR signals are shown to disappear or extremely reduce with increasing the field strength, whereas photoluminescence intensity is unchanged and photocurrent rather increases. This is clear evidence that e-h pairs are dissociated by the field. A simple model for pair dissociation is proposed and explains the field dependence of PLDMR intensity.