Fig. 1: Emission polarization in anisotropically dielectric-confined NCs. | Nature Communications

Fig. 1: Emission polarization in anisotropically dielectric-confined NCs.

From: Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes

Fig. 1

a Calculated ratio of horizontal (x) to vertical (z) local field factor, fx/fz, as a function of AR considering individual cuboidal and spheroidal perovskite NCs (ϵNC = 4.7) embedded in a low-dielectric-constant ligand (ϵm = 2.129) medium. Right panels present simulated electric field distributions near a representative square ANC of AR = 10 by applying a constant vertical (top) and horizontal (bottom) external electric field, Eext, revealing the polarization anisotropy. Calculated electric field intensity profiles (b) and radiation patterns (c) in the x–z plane for an out-of-plane (OP; left) and in-plane (IP; right) dipole placed in the center of a cubic NC and ANC of AR = 10 embedded in a dielectric emissive film sitting on the glass substrate. The dielectric anisotropy of ANC rescales the radiation from horizontal and vertical transition dipoles, thereby directing more light within the critical angle (red angular regions) for the glass-air interface (x–y plane).

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