The absorption and photoluminescence spectra of the solutions and crystals of ADP in the presence of dopant molecules (pH 3.5) and/or anion (pH 5.2) of salicylic acid and Tl+ cation are studied. Dissociation of salicylic acid at the first stage is accompanied with the formation of salicylate complexes with thallium phototautomer It is shown that the dopants are incorporated into the crystal, irrespectively of one another, in accordance with their distribution coefficients. The influence of the process of the impurity co-doping on the growth kinetics of the prismatic (100) ADP faces depends on the stoichiometry of the solution. The neutral H(2)Sal dopant monomers (pH 3.5) increase sigma(d) and diminish the growth rate. The HSal(-) dopant monoanions (pH 5.2) reduce the amount of sigma(d) and raise the growth rate. Tl+ ions in the solution increase sigma(d) and decrease the growth rate irrespectively of the pH. The influence of the HSa1(-)/Tl+ co-dopant (pH 5.2) on sigma(d) is almost 1.5 Limes lower than the one of the H(2)Sal/ Tl+ co-dopant (pH 3.5); both co-dopants reduce the growth rate. The crystal growth is realized via moving macrosteps. (C) 2015 Elsevier B.V. All rights reserved.