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Smart materials, such as stimuli-responsive luminescence, have attracted much attentions due to their potential application in semiconductor filed. In this context, platinum complexes of (dfppy-DC)Pt(acac) and (dfppy- O-DC)Pt(acac) were prepared and characterized, in which (2-(4',6'-difluorophenyl)pyridinato-N, C2')(2,4-pentanedionato- O,O)Pt(Ⅱ) was used as the planar emission core and 9-(4-(phenylsulfonyl) phenyl)-9 H-carbazole (DC) was regard as the bent pendent. Both platinum complexes showed bright emission in solution and solid state, concomitant with charming external-stimuli-responsive emission under mechanical grinding, organic solvent vapors and pressure. The change emission color spanned from yellow to near-infrared region. Using the platinum complexes as the dopant, solution processable organic light-emitting diodes (OLEDs) were fabricated and a maximum external quantum efficiency of ～18% was achieved, which is the highest value among the reported solution-processable OLEDs based on external-stimuli-responsiveluminescence. This researchdemonstratedthatplatinum complexcanshowpromising stimuli responsive emission via ingenious molecular design, indicating a novel way for developing the smart materials in semiconductor filed.