Spiro－Oxaziue染料掺杂高分子材料光致变色效应的研究

Study on Photochromic Effect in Spiro Oxazine Dye Doped Polymeric Films

报道Ｓｐｉｒｏ－Ｏｘａｚｉｕｅ染料掺杂高分子（ＳＯ／ＰＶＡ）膜具有很强的可逆光致变色效应，通过对这种高分子膜吸收光谱的测试，证实ＳＯ分子具有二个特征吸收带，一个在３６０ｎｍ，另一个在５９５ｎｍ，分别对应于二个分子异构体ＳＯ１和ＳＯ２，有关这种ＳＯ／ＰＶＡ光致变色过程的研究给出了ＳＯ１对紫外光和ＳＯ２对可见光（波长在５１５ｎｍ）的吸收系数分别为１．２ｃｍ２／Ｊ和６×１０－２ｃｍ２／Ｊ，ＳＯ２的寿命为３８ｓ。

A reversible strong photochromic phenomenon in spiro oxazine (SO) dye doped polyvinyl alcohol (PVA) films is reported. The absorption spectrum of the SO/PVA film shows that there are two characteristic absorption bands at 360 nm and 595 nm, which correspond to the two different molecular configurations SO 1 and SO 2, respectively. Then temporal behavior of the photo isomerization between the two molecular configurations is also investigated. The molecular absorption coefficients of SO 1 to UV light and SO 2 to the probe beam at 515 nm are found to be 1.2 cm 2/J and 6×10 -2 cm 2/J, respectively. The life time of SO 2 in dark is about 38 seconds. Spatial light modulation and UV to visible image conversion using this photochromic film are demonstrated experimently.