Wang Zhaoming, Wei Zixian, Cai Yuting, Wang Lei, Li Mutong, Liu Ping, Xie Rongjun, Wang Lai, Wei Guodan, Fu H Y
Tsinghua Shenzhen International Graduate School and Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China.
College of Materials, Xiamen University, Xiamen 361005, China.
ACS Appl Mater Interfaces. 2021 Nov 17;13(45):54143-54151. doi: 10.1021/acsami.1c15873. Epub 2021 Nov 8.
Cesium lead halide perovskite nanocrystals have recently become emerging materials for color conversion in visible light communication (VLC) and solid-state lighting (SSL), due to their fast response and desirable optical properties. Herein, perovskite nanocrystal-polymethyl methacrylate (PNC-PMMA) films with red and yellow emission are prepared. The PNC-PMMA films, with optical properties such as a short lifetime and air stability, are used to make broadband color converters based on a high-bandwidth 75 μm blue micro-LED (μLED) for VLC. The yellow-emitting CsPb(Br/I) PNC-PMMA has a high bandwidth of 347 MHz, while the red-emitting CsPbI PNC-PMMA exhibits a higher modulation bandwidth of 822 MHz, which is ∼65 times larger than that of conventional phosphors. After fixing the two PNC-PMMA films in front of the μLED, a qualified warm white light is generated with a correlated color temperature of 5670 K, a color rendering index of 75.7, and a de L'Eclairage (CIE) coordinate at (0.33, 0.35). Although the color conversion of the blue light sacrifices some received power and slightly reduces the overall bandwidth from 1.130 to 1.005 GHz, a maximum real-time data rate of 1.7 Gbps is still achievable using the non-return-to-zero on-off keying modulation scheme, which is ∼6 times higher than that of the previous record. This study provides a practical approach to develop a considerably high-bandwidth white-light system for both high-speed VLC and high-quality SSL.
卤化铯铅钙钛矿纳米晶体由于其快速响应和理想的光学特性，最近已成为可见光通信（VLC）和固态照明（SSL）中用于颜色转换的新兴材料。在此，制备了具有红色和黄色发射的钙钛矿纳米晶体-聚甲基丙烯酸甲酯（PNC-PMMA）薄膜。具有诸如短寿命和空气稳定性等光学特性的PNC-PMMA薄膜被用于制造基于用于VLC的高带宽75μm蓝色微发光二极管（μLED）的宽带颜色转换器。发射黄色光的CsPb(Br/I) PNC-PMMA具有347 MHz的高带宽，而发射红色光的CsPbI PNC-PMMA表现出更高的822 MHz调制带宽，这比传统磷光体的带宽大约大65倍。将这两种PNC-PMMA薄膜固定在μLED前面后，产生了合格的暖白光，其相关色温为5670 K，显色指数为75.7，色坐标（CIE）为（0.33, 0.35）。尽管蓝光的颜色转换牺牲了一些接收功率并使总带宽从1.130 GHz略微降低到1.005 GHz，但使用非归零开关键控调制方案仍可实现高达1.7 Gbps的最大实时数据速率，这比之前的记录高出约6倍。这项研究为开发用于高速VLC和高质量SSL的相当高带宽的白光系统提供了一种实用方法。
