Simulation of electroluminescence of quantum dot-based microcavity light-emitting device |
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Authors: | Ahmed Essam Ahmed Nabawy Morra Wageh Mohammed Swelm Atef El-Sayed Abou El-Azm |
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Institution: | (1) Department of Physics, Southeast University, 211189 Nanjing, People’s Republic of China;(2) Chien-Shiung Wu College, Southeast University, 211189 Nanjing, People’s Republic of China;(3) Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China |
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Abstract: | We present a detailed analysis and computations of the emitted radiation spectrum for quantum dots (QDs) microcavity light-emitting
device, where the total physical thickness of the cavity spacer was kept at 254 nm which corresponds to the wavelength of
the mode number (m) = 1 resonant mode of the cavity. Our calculation gives good results for QD diameter only from 1.2 to 6.4 nm.
The computations are used to examine how the emitted radiation spectrum can be optimized by varying the position of the light-emitting
layer, the type of cathode material, the choice of hole transport layer material, and the thickness of electron transport
layer, QD layer, and hole transport layer. These studies showed that the variation of layers geometry and the position of
the light-emitting layer will optimize the output intensity and the radiation spectrum and varying the ETL and QD layer thickness
will have a more effect on the emitted spectrum than varying HTL thickness. In addition, we have examined the effect of using
different quantum dots sizes in emission layer. On the other hand, we have investigated the difference between the electroluminescence
(EL) emissions for microcavity device in comparison with the non-cavity device, and we have found that the full width at half
maximum (FWHM) of the EL is reduced from 45 nm for the QD non-cavity LED to 30 nm for the output of a resonant microcavity
device. Finally, we have investigated the compatibility between our calculation and the experimental results and found a fairly
good agreement between them. |
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