Huang Jianhua, Yang Liuli, Feng Junhui, Xu Zheyuan, Kan Longwang, Song Hao, Huang Lixiang, Huang Ming, Li Ziwei, Pan Anlian
Hunan Institute of Optoelectronic Integration, College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
ACS Nano. 2025 Jun 24;19(24):22190-22200. doi: 10.1021/acsnano.5c03449. Epub 2025 Jun 12.
Perovskite quantum dots (PeQDs) have garnered significant attention as new-generation color-conversion materials for potential applications in microlight-emitting-diode (micro-LED)-based display devices. However, they still face challenges in achieving uniform size synthesis and ultrahigh color conversion efficiency. Here, all-inorganic PeQDs with uniform size and excellent stability were achieved through an optimized solvent-mediated synthesis using dodecyl acrylate (DA). This solvent not only enhances the solubility of the precursor, facilitating the rapid formation of intermediate monomers, but also induces abundant carbon-oxygen bonds for interface passivation, thereby enabling the controllable and slow nucleation of small-sized PeQDs. The highest photoluminescence quantum yield (PLQY) of 94.9% and 91.1% has been recorded for green and red PeQD solutions, respectively. The mechanisms behind the size-dependent improvement in luminescence performance have been elucidated and validated through transient absorption measurements and an emission-reabsorption model derived from simulations. Furthermore, our designed mixed-color film composed of green and red PeQDs exhibited ultrahigh overall stability, maintaining 76.7% of its initial intensity after being aged at 85 °C and 40 W m for 600 h. These promising mixed-color films were successfully utilized to enhance micro-LED displays, achieving a high luminous efficacy of 150 lm W and a color gamut of 130.2% of NTSC and 93.4% of BT.2020.
钙钛矿量子点（PeQDs）作为新一代颜色转换材料，在基于微发光二极管（micro-LED）的显示设备中的潜在应用已引起广泛关注。然而，它们在实现均匀尺寸合成和超高颜色转换效率方面仍面临挑战。在此，通过使用丙烯酸十二酯（DA）的优化溶剂介导合成法，制备出了尺寸均匀且稳定性优异的全无机PeQDs。这种溶剂不仅提高了前驱体的溶解度，促进了中间单体的快速形成，还诱导了大量碳 - 氧键用于界面钝化，从而实现了小尺寸PeQDs的可控且缓慢成核。绿色和红色PeQD溶液的光致发光量子产率（PLQY）分别达到了94.9%和91.1%的最高值。通过瞬态吸收测量和基于模拟的发射 - 再吸收模型，阐明并验证了发光性能随尺寸变化而改善的背后机制。此外，我们设计的由绿色和红色PeQDs组成的混合色膜表现出超高的整体稳定性，在85°C和40 W m下老化600小时后，仍保持其初始强度的76.7%。这些前景广阔的混合色膜成功用于增强微LED显示器，实现了150 lm W的高发光效率以及130.2%的NTSC色域和93.4%的BT.2020色域。
