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The method to regulate the concentration of graphene oxide (GO) via changing polarity of solution was developed, then the Tb(acac)n(PMA)n/GO composites were synthesized by coordination bond. The tunable photoluminescence property is achieved under different concentration of GO dispersion. The mechanism of tunable luminescence also is elucidated in details. Simultaneously, the strong thermal stability of Tb(acac)n(PMA)n/GO complexes series is performed because of the function of PMA, which suggests potential application in optical fields such as photo-electric device. [ABSTRACT FROM AUTHOR]