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Strontium tetraborate, SrB₄O₇, (SBO) has been investigated as a potential nonlinear optical material with excellent mechanical and optical properties such as a high power second harmonic generation (SHG) coefficient, high optical damage threshold, high hardness, etc. Additionally, the SBO crystals possess high UV transmittance at wavelengths down to about 130 nm. SrB₄O₇ congruently melts at 994 °C.

Strontium tetraborate is transparent across the far UV to far infra-red spectrum. Thus, it has great potential for use as lens components in optical devices such as those used for the fabrication of very large scale integrated circuits by a lithographic technique. A number of phosphors based upon the matrix, SrB₄O₇, have been investigated. Strontium tetraborate when activated by Eu2⁺, is used as a phosphor in “black-light” lamps for tanning salons.