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We report on an optical oxygen sensor for aqueous media. The phosphorescent signal from the indicator, K 2 Mo 6 Cl 14 , immobilized in a polymer matrix, is quenched by ground state 3 O 2. Continuous measurements ͑⌬t=10 s͒ over 36 h in oxygen atmospheres ͑0%-21%͒ were obtained with a signal to noise ratio better than 150. Photobleaching was not observed over ϳ13 000 measurements. The senor response at 10, 22, and 37°C water is governed by bimolecular collisional quenching, as evidenced by a linear fit to the Stern-Volmer equation for dissolved oxygen in the range 0 Ͻ ͓O 2 ͔ Ͻ 3 ϫ 10 −4 .

Transparent photovoltaic (TPV) devices have a number of unique advantages compared with opaque photovoltaic devices. However, balancing efficiency and transparency has been difficult. To date, few TPV devices with PCE over 1% have been demonstrated when the average visible transmission (AVT) is over 70%. Here, we report a series of lead halide based TPVs with both increased efficiency and transparency. The effects of lead halide layer thickness and composition were systematically studied. Subsequently, the efficiency, transparency, and stability of lead halide TPVs were evaluated. Results show that lead halide TPVs with ultraviolet (UV) wavelength-selective absorption can achieve efficiencies over 1% while the AVT is above 70%. This study provides a simple approach to prepare UV-harvesting TPVs with high efficiency and high visible transparency that are potentially viable as single-junction cells or as a component of multijunction transparent and opaque cells.

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