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将罗丹明6G(Rh6G)溶入到PDLC中,制备出一种可激发荧光的荧光-聚合物分散液晶薄膜。分别对普通PDLC和荧光-PDLC透射谱在可见光范围内进行了测试,与普通PDLC相比,荧光-PDLC透射谱在535nm附近存在1个吸收峰,并且透射光强在550～580nm波段急剧增大。实验给出了罗丹明6G溶液的吸收谱和发射谱,从而证实了掺入的罗丹明6G分子是导致上述差异的原因。为了进一步研究荧光-PDLC的光电特性,在λ=532nm绿激光照射下,对荧光-PDLC薄膜透射光随角度-电压的变化进行了测试。结果表明,透过的绿光与激发的荧光随角度的变化呈现不同电压调制规律。散射角在0°～4°范围内,绿光光强随电压的增加而增加;散射角在5°～26°之间,绿光光强随电压的增大先增大后减小;当散射角大于27°时,绿光光强随电压增加一直减小;然而荧光光强随电压的增加一直减小,且服从高斯分布。
Rhodamine 6G (Rh6G) was dissolved in PDLC to prepare a fluorescent-polymer dispersed liquid crystal film which can excite fluorescence. The transmission spectra of ordinary PDLC and fluorescence-PDLC were tested in the visible range respectively. Compared with the ordinary PDLC, there was one absorption peak around 535nm in fluorescence-PDLC and the intensity of transmitted light sharply increased in the wavelength range of 550-580nm . The absorption and emission spectra of rhodamine 6G solution were given experimentally, which confirmed that the incorporation of rhodamine 6G is the reason for the above difference. In order to further study the photoelectric characteristics of fluorescence-PDLC, the change of angle-voltage of the transmitted light of the fluorescence-PDLC film was tested under the green laser irradiation of λ = 532nm. The results show that the transmission of green light and excited fluorescence with the angle of the voltage showed different modulation. The scattering angle is in the range of 0 ° ~ 4 °, and the light intensity of green light increases with the increase of voltage. The scattering angle is between 5 ° ~ 26 °. The green light intensity first increases and then decreases with the increase of voltage. When the scattering angle is greater than 27 °, the light intensity of green light decreases with increasing voltage; however, the fluorescence intensity decreases with increasing voltage and obeys Gaussian distribution.