A bisthienylethene-dipyrimido[2. 1-b][1. 3]benzothiazole (BTE-2PBT) triad has been designed and synthesized based on our recent discovery of PBTs as atypical propeller-shaped novel AIEgens. The triad not only maintains the photochromic properties of BTE moiety in solution. https://www.tamalpies.com/product-category/primitive-bow/