“…To further investigate the color change of the films, the optical variation was also tracked in terms of the CIE L*a*b* 1976 Color Space, as shown in Figure g,h. L* represents the transmittance of light through a sample, while a* represents how red versus green the material is, and b* represents how red versus yellow the material is. , From the experimental results, the optical colors of the two conjugated polymers were quite similar. For example, in their neutral state, both polymers showed transparent (e.g., ( L* , a* , b* ) values of (98.8, −2.3, 5.0) and (97.4, 0.2, 4.6) for pCBCB and p3CBCB, respectively).…”