Using 3.0 eV Large Bandgap Conjugated Polymer as Host Donor to Construct Ternary Semi-Transparent Polymer Solar Cells: Increased Average Visible Transmittance and Modified Color Temperature.

Although optical engineering strategy has been utilized to optimize average visible transmittance (AVT) of semi-transparent organic solar cells (ST-OSCs), judicious selection of active layer materials should be more direct and basic. Herein, an efficient ternary active layer is constructed with a wide bandgap (3.0 eV) fluorescent polymer FC-S1 as host donor, a middle bandgap polymer PM6 as guest donor, and a narrow bandgap non-fullerene Y6-BO as acceptor. Using FC-S1 as the host donor can allow more visible photons to penetrate the device. In the absence of optical engineering, the ternary ST-OSC with FC-S1:PM6:Y6-BO = 1:0.3:1.5 active layer of 30 nm thickness displays a much higher AVT of 49.28% than that of 32.34% for a PM6:Y6-BO = 1.3:1.5 based binary ST-OSC. The ternary ST-OSC provides a good power conversion efficiency of 6.01%, only slightly lower than 7.15% for the binary ST-OSC. The ternary ST-OSC also demonstrates a color rendering index (CRI) of 87 and a correlated color temperature (CCT) of 6916 K, all better than CRI of 80 and CCT of 9022 K for the binary ST-OSC. Moreover, the backbone of FC-S1 is mainly composed by fluorene and carbazole, two easily-accessible aromatic rings, which would meet low-cost concern of ST-OSCs.

[Inhibitory effect of grape procyanidin on the cell apoptosis induced by radiation].

OBJECTIVE: To study the inhibition effect of grape procyanidin (GPC) on the cell apoptosis and injury of proliferation induced by radiation. METHODS: Three indices including apoptosis rate, proliferation rate and expression of bcl-2 and bax protein were examined in the mice pancreas after taking different dose GPC by mouth and radiation by (60)Co-gamma ray once. RESULTS: The cell proliferation and bcl-2 expression in high dose GPC group (3.16% +/- 0.13% and 49.8% respectively), were higher than those in radiation control group (0.64% +/- 0.11%, 29.7%), but the cell apoptosis rate and bax expression (19.8% and 55.0% respectively), were lower than those in radiation control group (35.6%, 85.7%). All the above differences were statistically significant (P < 0.05). CONCLUSION: GPC has certain protective effect against the mice pancreatic cell apoptosis and the abnormal expression of bcl-2 and bax protein induced by (60)Co-gamma.