3D electrothermal simulations of organic LEDs showing negative differential resistance
3D electrothermal simulations of organic LEDs showing negative differential resistance
复制标题
显示负微分电阻的有机 LED 3D 电热模拟
DOI:
10.1007/s11082-017-1167-4
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发表时间:
2017
影响因子:
3
通讯作者:
S. Reineke
中科院分区:
文献类型:
--
作者:
M. Liero;J. Fuhrmann;A. Glitzky;T. Koprucki;A. Fischer;S. Reineke
Organic semiconductor devices show a pronounced interplay between temperature-activated conductivity and self-heating which in particular causes inhomogeneities in the brightness of large-area OLEDs at high power. We consider a 3D thermistor model based on partial differential equations for the electrothermal behavior of organic devices and introduce an extension to multiple layers with nonlinear conductivity laws, which also take the diode-like behavior in recombination zones into account. We present a numerical simulation study for a red OLED using a finite-volume approximation of this model. The appearance of S-shaped current–voltage characteristics with regions of negative differential resistance in a measured device can be quantitatively reproduced. Furthermore, this simulation study reveals a propagation of spatial zones of negative differential resistance in the electron and hole transport layers toward the contact.
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