Magnetic and luminescent properties of nickel-doped ZnSe crystals

• Comparative analysis of emission and magnetic properties of ZnSe:Ni crystals was made.
• Tendency to uniform distribution of the Ni ions was shown.
• Threshold concentration of Ni impurity for magnetic and emission properties was estimated.

Magnetic and photoluminescent properties of nickel-doped ZnSe crystals with impurity concentrations varied by changing the Ni amount in the source material from 0.001 to 0.50 at.% are studied in 5–300 K temperature range. Investigation of magnetic properties shows that Ni impurity in ZnSe forms isolated paramagnetic centers and probability of Ni–Ni pairs formation is negligible due to low Ni concentration in the samples. The contribution of Ni impurity to edge emission and its influence on infra-red emission are discussed. It is found that complete concentration quenching of luminescence within all studied spectral range is observed starting with Ni concentration of 0.50 at.%.

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