<p>The electro-optical properties of WS₂ and MoS₂ nanoribbons were investigated. The WS₂ and MoS₂ armchair nanoribbons are a finite direct band gap semiconducting material. However, their zigzag nanoribbons are metallic. The estimated static dielectric constant is maximum for Z-WS₂ around 10.5 and for Z-MoS₂ around 10.0. These nanoribbons are excellent absorbers of ultraviolet (UV) radiation. Hence, these may be useful for absorption bands/filters. The fast absorption of light is consistent with the high extinction coefficient. The calculated refractive index shows the strong refraction of light in Z-WS₂. The obtained refractive indices are as follows: Z-WS₂ &gt; Z-MoS₂ &gt; A-MoS₂ &gt; A-WS₂. These materials exhibit a less than 15% reflection coefficient in the low-energy. This indicates that these are excellent antireflection coating materials. The corresponding transmission coefficient also corroborates the reflection spectrum. Moreover, the energy loss function shows that the most losses are in the UV region. These are due to the existence of plasma oscillations. The calculated real optical conductivity exhibits the induced in-phase current and resistive Joule heating phenomenon. The present observations reveal applications of these nanomaterials in nanoelectronics and optoelectronics.</p>