Orthogonal Trichromatic Upconversion with High Color Purity in Core‐Shell Nanoparticles for a Full‐Color Display

Abstract

Materials with tunable emission colors has attracted increasing interest in both fundamental research and applications. As a key member of light‐emitting materials family, lanthanide doped upconversion nanoparticles (UCNPs) have been intensively demonstrated to emit light in any color upon near‐infrared excitation. However, realizing the trichromatic emission in UCNPs with a fixed composition remains a great challenge. Here, without excitation pulsed modulation and three different near‐infrared pumping, we report an experimental design to fine‐control emission in the full color gamut from core–shell‐structured UCNPs by manipulating the energy migration through dual‐channel pump scheme. We also demonstrate their potential application in full‐color display. These findings may benefit the future development of convenient and versatile optical methos for multicolor tuning and open up the possibility of constructing full‐color volumetric display systems with high spatiotemporal resolution.

Methylene blue loaded K0.3Bi0.7F2.4:Yb,Er upconversion nanoparticles for near-infrared activated photodynamic therapy

“…[14][15][16][17] However the synthesis of these materials requires toxic organometallic precursors, large amounts of expensive rare earth salts and time-consuming, high temperature reaction processes. 15,18 Consequently, lanthanide-doped bismuth fluorides are emerging as a promising family of phosphor materials because of their unique characteristics, such as absence of toxic elements, excellent luminescence efficiency, photostability, low phonon energy and high refractive index. [19][20][21][22][23] Apart from this bismuth is a low-cost and non-toxic metal, which has been extensively used in display, optical sensing and biomedical fields.…”

Multicolor Tunable Upconversion Luminescence via Near‐Infrared Manipulation of Population Pathways of Er3+ Ions Excited‐State Levels for Volumetric Color Displays

“…[14,15,20] However, these methods suffer from several intrinsic limitations associated with fussy and elaborate composition optimization, [17,18] complex color modulation, [21] and inconsistent multiple colors purity and luminescence brightness in mixed materials. [22] Besides, the above approaches generally lead to poor color pixels and low optical resolution, [22][23][24][25] which greatly restrict their further practical applications. Therefore, regulating emission color over a wide wavelength range in a single material still remains a great challenge.…”

Full-color emission of fluorinated benzothiadiazole-based D–A–D fluorophores and their bioimaging applications

“…3 Among them, as representatives of multicolor luminophores, quantum dots and carbon dots have attracted enormous attention owing to their high quantum yield (F F ) and color purity. 4 However, they still have some disadvantages, e.g., an unclear luminescence mechanism and an ambiguous structure-property relationship, resulting in a narrow spectral range and difficulty in achieving solid-state emission. 5 Thus, many research groups have developed plenty of full-visible color-tunable organic fluorophores based on donor-acceptor (D-A) systems.…”