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Triphenylamine (TPA) based di-aldehyde fluorophores have been synthesised and utilized for fabricating solid thin film fluorescence assay for hydrazine sensing and rewritable fluorescence platform. Addition of hydrazine reacts with aldehyde and strongly quenched the fluorescence intensity in solutions. Interestingly, fluorophores integrated into PMMA thin films showed strong blue fluorescence and exhibited turn-off fluorescence upon immersing in hydrazine solution (5%) and turn-on fluorescence by immersing in acetic acid (5%). Concentration dependent studies revealed the limit of detection (LOD) of 9.3–14.0 μM in solution and 0.021% by solid matrix. Reversible off-on fluorescence switching both in solution and PMMA matrix has been achieved by acid and base exposure that has been successfully used for demonstrating rewritable fluorescent platforms. Reusable solid fluorescent sensor and rewritable fluorescent platforms have been developed by integrating di-triphenylamine aldehyde fluorophore with PMMA matrix. Image 1 • Halochromic off-on fluorescence switching in solution as well as solid state. • Fabrication of rewritable fluorescence platforms. • Selective fluorescence sensing hydrazine. • PMMA based reusable solid fluorescence assay for hydrazine. [ABSTRACT FROM AUTHOR]