Figure 2
Calculation of the performance map of the 
and the Bv for two hundred and fifty-three materials chosen in ICSD.
Inset enlarges the key area for the exploration. Here, the regions as noted with LWP-Cover (dark green shading, 9.6~14.5 μm) and with LWF-Cover (bright green shading, >14.5 μm) are for long-wave-partial and long-wave-full transmitting windows by our redefined criteria. The pink stars show the cases of the current popular IR window materials10, which demonstrates the division reasonable. The dot line is in the middle of the LWP region. The orange squares highlight the potential infrared window candidates (with notice by orange arrow as well) above the dot line. The samples noted by the purple circles are excluded due to no significant band gap based on the calculations. Other gaped materials below the dot middle line are shown with half filled orange squares or pink stars.
