Electrospinning Derived One‐Dimensional LaOCl: Ln3+ (Ln = Eu/Sm, Tb, Tm) Nanofibers, Nanotubes and Microbelts with Multicolor‐Tunable Emission Properties

Abstract

One‐dimensional LaOCl: Ln 3+ (Ln 3+ = Eu 3+/Sm 3+, Tb 3+, Tm 3+) nanofibers, nanotubes, and quasi‐1D microbelts are successfully prepared by a sol–gel/electrospinning process. XRD, FT‐IR, SEM, TEM, as well as photoluminescence (PL) and cathodoluminescecne (CL) spectra are used to characterize the resulting samples. Through a heat treatment process at high temperature, the as‐prepared samples are well‐crystallized with the tetragonal structure of LaOCl. Under ultraviolet radiation and low‐voltage electron beam excitation, the LaOCl: Eu 3+, LaOCl:Sm 3+, LaOCl: Tb 3+, and LaOCl: Tm 3+ samples give the characteristic transitions of Eu 3+ (5 D 0, 1, 2 → 7 F 0, 1, 2, 3, 4), Sm 3+ (4 G 5/2 → 6 H 5/2, 7/2, 9/2), Tb 3+ (5 D 3, 4 → 7 F 2, 3, 4, 5, 6), and Tm 3+ (1 D 2, 1 G 4 → 3 F 4, 3 H 6), respectively. Moreover, there exists simultaneous luminescence of Tb 3+, Tm 3+, Eu 3+, or Sm 3+ individually when codoping them in the single‐phase LaOCl host (for example, LaOCl: Tb 3+, Eu 3+/Sm 3+; LaOCl: Tm 3+, Eu 3+/Sm 3+; LaOCl: Tb 3+, Tm 3+, Eu 3+/Sm 3+ systems), which is beneficial to tune the emission colors. Under low‐voltage electron beam excitation (1–5 kV), a variety of colors can be efficiently adjusted in a wide triangle region enveloped by three CIE chromaticity coordinate points [LaOCl:Eu 3+, (x = 0.6039, y = 0.3796); LaOCl: Tb 3+, (x = 0.2452, y = 0.5236); LaOCl: Tm 3+, (x = 0.1456, y = 0.0702)] for mono‐ and co‐doped LaOCl: Ln 3+ (Eu 3+, Sm 3+, Tb 3+, Tm 3+) samples, making these materials have potential applications in field‐emission display devices.