Refractive index database

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Optical constants of Nb2O5 (Niobium pentoxide)
Horcholle et al. 2022: Thin film annealed at 400 °C; n,k 0.207–0.827 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Nb2O5 thin film deposited by reactive magnetron sputtering and annealed by rapid treatment annealing at 400 °C


B. Horcholle, C. Labbé, X. Portier, P. Marie, C. Frilay, W. Yuan, W. Jadwisienczak, D. Ingram, C. Grygiel, J. Cardin. Growth and study of Tb3+ doped Nb2O5 thin films by radiofrequency magnetron sputtering: photoluminescence properties. Appl. Surf. Sci. 597, 153711 (2022) (Numerical data kindly provided by Julien Cardin)


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Niobium pentoxide, Nb2O5

Niobium pentoxide (Nb2O5) is a pale yellow compound that is commonly used in the manufacture of certain optical glasses, where it imparts a high refractive index. In addition to its use in specialty glasses, Nb2O5 has garnered attention in the photonics industry due to its nonlinear optical properties, making it suitable for devices like waveguides and modulators. The material also finds application in the field of electronics as a dielectric layer in capacitors and has potential in the development of electrochromic devices. Its high dielectric constant further positions it as a candidate for thin film capacitors and transistors.

Other names

  • Niobium(V) oxide
  • Niobium pentaoxide
  • Dininiobium pentoxide
  • Diniobium pentaoxide

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