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The absorption spectra of PbSe quantum dots depend on the size of PbSe quantum dots, as shown in Figure 2, where the spectra of three different sized PbSe QDs are superimposed with their longest wavelength maximum normalized to one absorbance unit. Efforts are being made to achieve low cost up-conversion devices that have higher conversion efficiencies, although no device has been identified that allows sufficient efficiency to be considered a practical up-conversion device. |
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