Screen printing strategy for fabricating flexible crystallized perovskite nanocomposite patterns with high photoluminescence

Organohalide perovskites have been witnessed as an emerging class of solution processable semiconductor with huge potential for applications in optoelectronic devices. However, a low-cost and high-yield patterning of these materials needs to be further improved. Herein, we demonstrated a facile approach to pattern perovskite nanocrystals embedded in polymer matrix by screen printing strategy. Importantly, this strategy achieves a champion photoluminescence quantum yield up to 96.5% and exhibited an intense green emission band centered at 517 nm with narrow full width at half-maximum of 20 nm. In addition, the composite films show an extraordinary stability in various environments, such as air, water, high temperature (80 degrees C), and Ultraviolet -radiation. The photoluminescence intensity of composite films decreases only 1.4% after being stored in air with 85% relative humidity for 3 months and remains 81.6% of initial values after being submerged in water for 3 months. Finally, we printed high-resolution patterns of 175 mu m, demonstrating that the screen printing is very promising for patterning perovskite composite microarrays.