Refractive index database

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Optical constants of ZnO (Zinc monoxide)
Stelling et al. 2017: n,k 0.302–1.685 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Isotropic ZnO thin film (thickness 40 nm) on silicon substrate.


C. Stelling, C. R. Singh, M. Karg, T. A. F. König, M. Thelakkat, M. Retsch. Plasmonic nanomeshes: their ambivalent role as transparent electrodes in organic solar cells, Sci. Rep. 7, 42530 (2017) - see Supplementary information (Numerical data kindly provided by Tobias König)


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Zinc monoxide, ZnO

Zinc oxide (ZnO) is a direct bandgap semiconductor with a wide bandgap of approximately 3.37 eV. This unique property makes it a material of significant interest for various optoelectronic applications, including solar cells, sensors, and LEDs. ZnO also exhibits piezoelectric properties, which are exploited in the design of sensors and actuators. It naturally forms in a hexagonal wurtzite crystal structure, displaying strong luminescence even at room temperature. Additionally, ZnO is a transparent conductive oxide, meaning it conducts electricity while remaining transparent to visible light, making it useful in transparent electronics and touchscreens. Due to its antibacterial and UV-blocking properties, ZnO is also commonly used as an ingredient in cosmetics and sunscreens.

Other names

  • Zinc(II) oxide
  • Zinc oxide
  • Zinc white
  • Calamine

External links