Organic materials with π-conjugated systems have attracted interest as one of the candidates for nonlinear optical materials. Low dielectric constant characteristics are also an advantage of organic materials, especially for Electro-Optic (OE) devices, enabling high speed and low power operation. In order to integrate various types of thin-film photonic/electronic devices, a low-cost heterogeneous integration process is required. In photolithographic packaging with selectively occupied repeated transfer, heterogeneous integration can be performed by delivering OE devices from a set of wafers. Photoluminescence spectra of an styrylpyridinium cyanine dye (SPCD) thin-film crystal, SPCD powder used as the starting material for the crystal growth, and a water solution of SPCD were measured with a He-Cd laser excitation light source at room temperature. Molecular crystals have also been known to show the Pockels effect, which, as well as second harmonic generation, is involved in second-order nonlinearity.