The optimized formulations were able to be 3D printed, thus transferring the PL properties of the perovskite to the printed solid, as shows Fig. 1C. In addition, the absorption wavelength of the perovskite was modified changing the halides, obtaining films with different colours (see Fig. S11 †): CsPbCl 1.5Br 1.5 (PS 2) and CsPbCl 2.25Br 0.75 (PS 3) ( Fig. 1E). At this point, the mixture of PNCs and PILs is suitable to fabricate highly emitting 3D solids which improved intrinsic properties (as we will show below).

For long URLs, you might find it easier and less error-prone, to use an online URL encoder/decoder. These type of utilities should also be able to detect illegal characters automatically in the URL as well.

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