Emission wavelength control of CsPb(Br1−xClx)3 nanocrystals for blue light-emitting diode applications. Issue 14 (19th March 2021)

• Record Type: Journal Article
• Authors: Cho, Seung-Bum; Jung, Jin-Woo; Kim, Yoon Seok; Cho, Chang-Hee; Park, Il-Kyu
• Is Part Of: CrystEngComm. Volume 23:Issue 14(2021)
• Page Start: 2746
• Page End: 2755
• Publication Date: 2021-03-19
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d1ce00132a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : A facile synthetic method of CsPb(Br1− x Cl x )3 halide perovskite nanocrystals, which emit light with the wavelengths ranging from green to blue based on an anion exchanging reaction using a halide exchange additive was reported. Abstract : All-inorganic materials, mixed halide perovskite (MHP) nanocrystals (NCs), have attracted considerable attention recently because of their excellent luminescence efficiencies and extraordinary physical properties, making them a promising material for next-generation lighting and full-color display. On the other hand, an essential development of blue-emitting devices rather than other color emitters has been hindered by their defect tolerance and quantum efficiency which are relatively lower than those of green-emitting NCs. Moreover, few studies have examined the synthesis and properties of blue-emitting MHP NCs or their applications to light-emitting diodes (LEDs). To solve these problems, this paper reports a facile and controllable way of producing emission wavelength tunable CsPb(Br1− x Cl x )3 NCs using a fast and straightforward chemical treatment with the trimethylsilyl chloride (TMSC) additive. Structural and chemical analysis showed that the Cl content in the CsPb(Br1− x Cl x )3 NCs could be modulated by TMSC addition without changing the morphologies. The photoluminescence emission peak wavelength of the CsPb(Br1− x Cl x )3 NCs could be modulated from 515 to 416 nm by increasing the TMSC content. To this end, blue and green LEDs were successfully demonstrated by using the TMSC-treated CsPb(Br1− x Cl x )3 NCs as an emissive layer, showing a controllable emission wavelength from 473 to 511 nm.