Highly Efficient and Stable CsPbBr 3 -Alginic Acid Composites for White Light-Emitting Diodes.

All-inorganic perovskite nanocrystals (NCs) have attractive potential for applications in display and lighting fields due to their special optoelectronic properties. However, they still suffer from poor water and thermal stability. In this work, green CsPbBr₃-alginic acid (CsPbBr₃-AA) perovskite composites were synthesized by an in situ hot-injection process which showed a high photoluminescence quantum yield (PLQY) of 86.43% and improved moisture and thermal stability. Finally, white light-emitting diodes (WLEDs) were fabricated by combining the green CsPbBr₃-AA perovskite composites with red K₂SiF₆:Mn⁴⁺ phosphors and blue InGaN LED chips. The WLEDs show a relatively high luminous efficacy of 36.4 lm/W and a wide color gamut (124% of the National Television System Committee). These results indicate that the green CsPbBr₃-AA perovskite composites have great potential applications in backlight displays. [ABSTRACT FROM AUTHOR]