Abstract
Dissolving ⋍ 1000 ppm (1 ppm ≡ 1 μ mol/ mol) 7,7,8,8-tetracyanoquinodimethane (TCNQ) in a superheated melt of 2-cyclooctylamino-5-nitropyridine (COANP) leads to formation of mainly [TCNQ] −2 2 that is incorporated into the COANP crystal lattice by supercooled melt growth at supercoolings smaller than ΔT ⩽ 0.5 − 1.5° C. Obtained doped COANP crystals show an extra optical absorption at λ max ⋍ 650 nm and are photorefractive. The found photorefractive effects are most probably induced by the presense of ∼ 50 ppm [TCNQ] −2 2.
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