White LED based on CsPbBr3 nanocrystal phosphors via a facile two-step solution synthesis route

• Published in: Materials research bulletin Vol. 104; pp. 48 - 52
• Main Authors: Yue, Wang, Liu, Yang, Heyu, Chen, Chunyang, Liu, Weizhen, Liu, Haiyang, Xu, Cen, Zhang, Zhongqiang, Wang, Yichun, Liu
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01.08.2018
• Subjects: A. Halides; A. Inorganic compounds; B. Chemical synthesis; B. Luminescence; B. Optical properties; ELECTROLUMINESCENCE; GALLIUM NITRIDES; HETEROJUNCTIONS; INORGANIC PHOSPHORS; LIGHT EMITTING DIODES; MONOCRYSTALS; NANOPARTICLES; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; PEROVSKITE; PHOTOLUMINESCENCE; SYNTHESIS; TEMPERATURE DEPENDENCE; TIME RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; ZINC OXIDES; B. Chemical synthesis; A. Halides; B. Optical properties; A. Inorganic compounds; B. Luminescence
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2018.03.055

[Display omitted] •The work shows a simple and effective strategy to synthesize perovskite materials.•A LED with CsPbBr3 nanocrystals as green phosphors was fabricated.•Notable stability of the CsPbBr3 nanocrystals was verified. All-inorganic CsPbBr3 perovskite nanocrystals with mean size of ∼300 nm were synthesized via a facile two-step solution synthesis route. High-resolution transmission electron microscopy and X-ray diffraction characterizations confirm the as-prepared CsPbBr3 nanoparticles are single-crystals with good crystallinity, although a CsPb2Br5 impure phase also exists in the final product. Power-/temperature-dependent and time-resolved photoluminescence measurements reveal the notable and stable excitonic emission feature of these CsPbBr3 nanocrystals. As a proof-of-concept demonstration, a LED with p-GaN/n-ZnO heterojunction as blue-violet excitation chip and CsPbBr3 nanocrystals as green phosphors, was fabricated and a white electroluminescence was achieved from this perovskite nanocrystals decorated LED.