Influence of a two-dimensional SiO[sub 2] nanorod structure on the extraction efficiency of ZnS:Mn thin-film electroluminescent devices

Young Rag Di, J.M.; Yoon Chang Kim, J.M.; Sang-Hwan Cho, J.M.; Dong Sik Zang, J.M.; Young-Duk Huh, J.M.; Sun Jin Yun, J.M.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1377
Academic Journal
To improve light extraction from thin-film electroluminescent (TFEL) devices, we have introduced a two-dimensional (2-D) SiO[sub 2] nanorod pattern into the glass substrate of a TFEL. This periodic modulation converts the guided waves in the high refractive index ZnS:Mn phosphor layers into leaked external waves. We used the finite-difference time-domain method to optimize the structural parameters of the 2-D nanorod pattern. Using a nanorod pattern with a depth of 300 nm, a lattice constant of 600 nm, and a radius of 180 nm, the extraction efficiency of the TFEL is theoretically predicted to increase by a factor of more than 4.8. We compare the calculated efficiency and that of the actual TFEL structure, with a view to decreasing diameter of nanorod. © 2004 American Institute of Physics.


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