Two anthryl platinum(II) N,N'-bis(3,5-di-tert-butylsalicylidene)-1,2-benzenediamine Schiff base complexes were synthe-sized, with the anthryl attached via its 9 position (Pt-9An) or 2 position (Pt-2An) to the platinum (Pt) Schiff base backbone. The complexes show unusually small Stokes shifts (0.23 eV), representing a very small energy loss for the photoexcitation/intersystem crossing process, which is beneficial for applications as triplet photosensitizers. Phosphorescence of the Pt(II) coordination framework (Phi(P) = 11.0%) is quenched in the anthryl-containing complexes (Phi(P) = 4.0%) and shows a biexponential decay (tau(p) = 3.4 mu s/87% and 18.2 mu s/13%) compared to the single-exponential decay of the native Pt(II) Schiff base complex (tau(P) = 3.7 mu s). Femtosecond/nanosecond transient absorption spectroscopy suggests an equilibrium between triplet anthracene ((3)An) and triplet metal-to-ligand charge-transfer ((MLCT)-M-3) states, with the dark (3)An state slightly lower in energy (1.96 eV for Pt-9An and 1.90 eV for Pt-2An) than the emissive 3MLCT state (1.97 eV for Pt-9An and 1.91 eV for Pt-2An). Intramolecular triplet-triplet energy transfer (TTET) and reverse TTET take 4.8 ps/444 ps for Pt-9An and 55 ps/1.7 ns for Pt-2An, respectively. The triplet-state equilibrium extends the triplet-state lifetime of the complexes to 103 mu s (Pt-2An) or 163 mu s (Pt-9An), in comparison to the native Pt(II) complex, which shows a lifetime of 4.0 mu s. The complexes were used for triplet-triplet-annihilation upconversion with perylene as the triplet acceptor. The upconversion quantum yield is up to 15%, and a large anti-Stokes shift (0.75 eV) is achieved by excitation into the singlet metal-to-ligand charge-transfer absorption band (589 nm) of the complexes (anti-Stokes shift is 0.92 eV with 9,10-diphenylanthracene as the acceptor).