Refractive index database

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Optical constants of ZnS (Zinc sulfide)
Debenham 1984: Cubic ZnS; n 0.405–13 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Cubic ZnS, 20 °C


1) M. Debenham. Refractive indices of zinc sulfide in the 0.405-13-µm wavelength range, Appl. Opt., 23, 2238-2239 (1984)
2) C. A. Klein. Room-temperature dispersion equations for cubic zinc sulfide, Appl. Opt. 25, 1873-1875 (1986)
*Ref. 2 provides a modified Sellmeier equation based on data from Ref. 1


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Zinc sulfide, ZnS

Zinc sulfide (ZnS) is a semiconducting material that exhibits either a sphalerite (cubic) or wurtzite (hexagonal) crystal structure. It has a direct bandgap of around 3.68 eV for the cubic form and 3.91 eV for the hexagonal form. Due to its luminescent properties, ZnS has been extensively used in applications like electroluminescent panels, X-ray screens, and phosphorescent materials. Doped ZnS, especially with copper or silver, can produce phosphorescent materials widely used in various displays. ZnS is also employed as a host matrix in many quantum dot applications. Additionally, its infrared transmission capability makes it valuable for infrared optics, and it's frequently used in infrared windows and lenses.

Other names

  • Zinc sulphide
  • Zinc blende (cubic ZnS)


  • Sphalerite (mineral of cubic ZnS)
  • Wurtzite (mineral of hexagonal ZnS)

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