Film fabrication
This protocol is extracted from research article:
Programmable transparent organic luminescent tags
Sci Adv, Feb 1, 2019; DOI: 10.1126/sciadv.aau7310

Both NPB and PMMA were dissolved in anisole to reach a solution containing 2 wt % NPB and 98 wt % PMMA. The barrier material was dissolved in pure water at 95° to 130°C. For spin coating, a speed of 2000 rpm and volumes of 150 and 500 μl were used to form uniform films of emission and barrier layer, respectively. The layers were coated on top of each other. For drop casting, 150 and 500 μl were put onto the substrate for emission and barrier layer and dried overnight. The cleaned borosilicate and quartz glass substrates of a size of 25 mm by 25 mm were used as rigid substrates, while common adhesion foils were used as flexible ones. To spin-coat onto the latter, they were temporarily adhered onto glass carriers.

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