Room-Temperature Synthesis of Two-Dimensional Hexagonal Boron Nitride Nanosheet-Stabilized CsPbBr <inf>3</inf> Perovskite Quantum Dots

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Journal Article
ACS Applied Materials and Interfaces, 2019, 11 (8), pp. 8242 - 8249
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© 2019 American Chemical Society. Poor stability always restricts the application of all-inorganic perovskite quantum dots (PQDs). Herein, 2D hexagonal boron nitride (h-BN) nanosheets were firstly utilized to stabilize CsPbBr 3 PQDs through a facile heterogeneous nucleation-growth process at room temperature. In synthesized h-BN/CsPbBr 3 PQD nanocomposites, cubic CsPbBr 3 PQDs adhere on h-BN nanosheet surfaces, benefiting from the high specific surface area and abundant mesopores of 2D nanosheets. The nanocomposites prepared at optimized loading of h-BN nanosheets and reaction time display good green-emitting performance with a narrow full width at half maximum of â20.0 nm and high color purity of 92.0%. Unique 2D structure and excellent thermal conductivity of h-BN nanosheets endow the h-BN/CsPbBr 3 PQD nanocomposites with significantly enhanced humidity stability and thermal stability. The white light-emitting diodes (LEDs) assembled with green-emitting nanocomposites, a blue chip, and a commercial red phosphor possess a low correlated color temperature of 4190 K, color-rendering index of 76, and high luminous efficacy of 57 lm/W. Further, the color gamut of the synthetic white light based on blue-emitting h-BN/CsPbBr 1.5 Cl 1.5 PQDs, green-emitting h-BN/CsPbBr 3 PQDs, and red-emitting h-BN/CsPbBr 1.2 I 1.8 PQDs is 114% of the National Television System Committee standard. This work paves a new way for utilizing 2D nanomaterials to synthesize stable all-inorganic PQDs for white LEDs and displays.
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