Ultrathin, Friendly Environmental, and Flexible CsPb(Cl/Br)3-Silica Composite Film for Blue-Light-Emitting Diodes

Xiong Shen; Gaozhao Chen; Xin Peng; Fanfan Qi; He Liu; Wentao Hao; Qiuyun Ouyang

doi:10.1021/acs.langmuir.4c03070

Ultrathin, Friendly Environmental, and Flexible CsPb(Cl/Br)₃-Silica Composite Film for Blue-Light-Emitting Diodes

Langmuir. 2024 Dec 27. doi: 10.1021/acs.langmuir.4c03070. Online ahead of print.

Authors

Xiong Shen^{1

2}, Gaozhao Chen^{1

2}, Xin Peng^{1

2}, Fanfan Qi^{1

2}, He Liu^{1

2}, Wentao Hao^{1

2}, Qiuyun Ouyang^{1

2}

Affiliations

¹ Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications, Ministry of Industry and Information Technology of China, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.
² Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.

PMID: 39729285
DOI: 10.1021/acs.langmuir.4c03070

Abstract

Due to intrinsic defects in blue-light-emitting perovskite materials, the charge carriers are prone to being trapped by the trap states. Therefore, the preparation of efficient blue-light-emitting perovskite materials remains a significant challenge. Herein, CsPb(Cl/Br)₃ nanocrystal (NCs)@SiO₂ structures were fabricated through hydrolyzing (3-aminopropyl)-triethoxysilane (APTS). SiO₂ can passivate the surface trap states of NCs, suppress the nonradiative recombination pathways of NCs, and effectively stabilize the surface of NCs. CsPb(Cl/Br)₃ NCs@SiO₂ exhibits higher photoluminescence (PL) intensity and lifetime compared to those of the pure CsPb(Cl/Br)₃ NCs. The enhancement of the exciton binding energy (E_b) leads to increased PL intensity and lifetime in CsPb(Cl/Br)₃ NCs @SiO₂, as demonstrated by temperature-dependent PL spectra. Subsequently, a 0.3 mm film of CsPb(Cl/Br)₃ NCs@SiO₂/poly(methyl methacrylate) (PMMA) was fabricated through optimizing the casting method. Due to the effective protection provided by SiO₂ and PMMA, CsPb(Cl/Br)₃ NCs@SiO₂/PMMA film exhibits excellent thermal, water, and air stability. Moreover, the CsPb(Cl/Br)₃ NCs@SiO₂/PMMA film also exhibits good flexibility, maintaining the PL intensity unchanged under bending conditions. Importantly, lead can be well encapsulated in SiO₂ and PMMA, effectively preventing lead from leaking into the environment. This research demonstrates the potential of a CsPb(Cl/Br)₃ NCs@SiO₂/PMMA film for applications in the friendly environmental field of optoelectronics, including light-emitting diodes (LEDs) and flexible displays.