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CdS quantum dots prepared in ferritin, an α-helix-rich rhombic dodecahedral protein, showed left-handed cicularly polarized luminescence (CPL) from both direct transition and surface-trapping sites with relatively large anisotropy factors. Utilizing laser photoetching, the PL/CPL bands from surface-trapping sites blue-shifted with decreased QD size, but the direct transition band disappeared.
Naito et al. (Wed,) studied this question.