December 8, 2023
Light guide plate based on perovskite nanocomposites
The surface illuminance of LGPs doping with 0 wt% (a), CsPbCl3(b), CsPbCl2.5Br0.5(c), CsPbCl2.0Br1.0(d), CsPbCl1.5Br1.5(e) and CsPbCl1.0Br2.0(f) PNCs. The color scale under the bottom displays the color changes with the illuminance. (g), The schematic diagram of the light distribution scattered by a single PNC. The equation shows the relationship between the incident light intensity I0 and the scattering light intensity I and the μ can be regarded as a constant for a certain condition. The variations of scattering cross-section per unit solid angle of CsPbCl3(h), CsPbCl2.5Br0.5(i), CsPbCl2.0Br1.0(j), CsPbCl1.5Br1.5(k) and CsPbCl1.0Br2.0(l) PNCs with observation angle and wavelength. Credit: Chongming Liu, Zhicheng Zhu, Kaibo Pan, Yuan Fu, Kai Zhang and Bai Yang

The fact that nanoparticle and polymer hybrid materials can often combine the advantages of each has been demonstrated in several fields. Embedding PNCs into polymer is an effective strategy to enhance the PNCs stability and polymer can endow the PNCs with other positive effects based on different structure and functional groups.

The uniform distribution of PNCs in is critical to the properties of the nanocomposites and the aggregation of PNCs induced by high surface energy has a severe influence on the performance of related applications. As such, the loading fraction is limited owing to the phase separation between PNCs and polymer.

Chemical interaction between PNCs and polymer is necessary to suppress the phase separation. Meanwhile, most of the fabrication methods of PNCs/polymer nanocomposites are spin coating, swelling-shrinking and electrospinning based on the in-situ synthesis of PNCs in polymer matrix and physical mixing, but extremely few works can achieve the fabrication of PNCs/ nanocomposites by bulk polymerization.

In a new paper published in Light: Science & Applications, a team of scientists, led by Professor Bai Yang from State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, China, and co-workers have adopted a two-type ligand strategy to fabricate PNCs/polystyrene (PS) nanocomposites, where the undec-10-en-1-amine help PNCs disperse in styrene and the synthetic bis[(4-ethenylphenyl)methyl]dimethylammonium chloride works as polymerizable capping ligands to endow the PNCs with polymerization activity.

Light guide plate based on perovskite nanocomposites
(a), The graphical abstract of the work: The PNCs/PS nanocomposite is fabricated through a two-type ligand strategy, which is proper to serve as LGP in LCD-related application based on the Rayleigh scattering behavior of the PNCs. (b), The function of LGP: When the blue laser light transports through the bulk nanocomposite with different doping content, the light and its surface output can be uniformized and enhanced. Credit: Chongming Liu, Zhicheng Zhu, Kaibo Pan, Yuan Fu, Kai Zhang and Bai Yang

The bulk CsPbCl3 PNCs/PS nanocomposites can still maintain high transparency even at the doping content up to 5 wt%.

The can be ascribed to the Rayleigh scattering as the PNCs distribute uniformly without obvious aggregation. Based on this behavior, the scientists further exploit the potential of the PNCs/PS nanocomposites to serve as LGP and study the principle of this new type of LGP.

Through the facile composition adjustment of CsPbClxBr3-x (1≤x≤3) PNCs, the Rayleigh scattering behavior can be adjusted and the scientists systematically study the influence of PNCs composition on the performance of LGP by calculating the volume scattering coefficient and optical radiation efficiency of the nanocomposites.

Light guide plate based on perovskite nanocomposites
(a), The device configuration of the LCD display. The LCD module is about 5.0 inches in size. (b), The CIE 1931 diagram at the central region of the LCD screen based on the control LGP with no PNCs doping (0 wt%) and LGPs doping with CsPbClxBr3-x (1≤x≤3) PNCs under white light operating condition. The photographs of the BLU (top) and the LCD (bottom) under operation based on the control LGP without PNCs (c) and the LGP doping with CsPbCl2.5Br0.5 PNCs (d). (e), The results of the LGP uniformity test. Credit: Chongming Liu, Zhicheng Zhu, Kaibo Pan, Yuan Fu, Kai Zhang and Bai Yang

Furthermore, this new type of LGP is compatible with advanced liquid crystal display (LCD) technology. Both surface illuminance and uniformity show obvious improvement. For 5.0-inch LGP, the best performing LGP doping with 1 wt% CsPbCl2.5Br0.5 PNCs exhibits about 20.5 times higher illuminance and 1.8 times higher uniformity in display than the control.

This kind of LGP has potential in LCD-related applications and will draw much attention in LGP-related fields, especially as a base material to combine with the advanced LGP processing technologies such as the micro-optical pattern on the bottom or the adoption of the wedge-shaped plates.

More information:
Chongming Liu et al, Bulk CsPbClxBr3-x (1 ≤ x ≤ 3) perovskite nanocrystals/polystyrene nanocomposites with controlled Rayleigh scattering for light guide plate, Light: Science & Applications (2023). DOI: 10.1038/s41377-023-01306-z

Light guide plate based on perovskite nanocomposites (2023, November 3)
retrieved 5 November 2023

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