Publication date: 15th November 2022
In this contribution, we highlight the use of non-toxic active agents based on vitamins like α-tocopherol (α‑TCP, vitamin E) to enhance the photophysical properties and stability of perovskite nanocrystals (PNCs), through post-synthetic ligand surface passivation. This effect is especially interesting on CsPbI3 PNCs due to its poor black crystalline phase stability. Adding α‑TCP generate that photoluminescence quantum yield (PLQY) of freshly prepared and aged PNCs achieved values of ~98% and 100%, respectively. After storing the materials around 2 months under ambient air and 60% relative humidity, PLQY is kept at 85% and 67%, respectively, while pristine PNCs without the vitamin fully lost their emissivity. α-TCP restores the PL features of aged CsPbI3 PNCs, decreases the non-radiative carrier traps, and mediates the radiative recombination channels by reducing surface defects.[1,2] In addition, the combination of α‑TCP and PNCs favors the chemical formulation to prepare PNCs-acrylic polymer 3D composites processable by 3D printing. This enables the development of complex shaped parts with improved luminescent features and long-term stability for 4 months, which is not possible for PNCs in absence of α-TCP. We reached a PLQY ~92% in the 3D printed polymer/PNC composite, the highest value obtained for a red-emitting composite solid until now as far as we know. The passivation shell provided by α‑TCP makes that PNCs inks do not suffer any degradation process avoiding the contact with the environment and preserve their properties after reacting with polar monomers during composite polymerization. Accordingly, we provide an attractive approach to facilitate the manufacture of highly photoluminescent devices through 3D printing, with diverse and more complex geometries, and the preparation of stable and compatible PNCs inks with improved PL properties for inkjet printing applications and scalable optoelectronics.
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