Difluoroboron (BF₂) bound phenylacetylide was attached to the Pt(II) center of N⁁NPt(II) bisacetylide complex (Pt-1). Enhanced absorption in the visible region (ε = 1.37 × 10⁴ M⁻¹ cm⁻¹ at 434 nm) and emissive ³IL excited state (τ = 0.92 μs, Φ = 3.3%) were observed for Pt-1, compared to the model complex dbbpy Pt(II) bisphenylacetylide (Pt-2, τ = 0.90 μs, Φ = 40.0%. dbbpy = 4,4′-di-tert-butyl-2,2′-bipyridine). Pt-1 was used as the triplet sensitizer for triplet–triplet annihilation (TTA) based upconversion and an upconversion quantum yield (Φ_UC) of 8.9% was observed with 9,10-diphenylanthracence (DPA) as the triplet acceptor. In comparison, no upconversion was observed for the model complex Pt-2.