Orthogonal R/G/B Upconversion Luminescence-based Full-Color Tunable Upconversion Nanophosphors for Transparent Displays

Abstract

Here, excitation orthogonalized red/green/blue upconversion luminescence (UCL)-based full-color tunable rareearth (RE) ion-doped upconversion nanophosphors (UCNPs) are reported. The LiREF 4 -based core/sextuple-shell (C/6S) UCNPs are synthesized, and they consist of a blue-emitting core, green-emitting inner shell, and red-emitting outer shell, with inert intermediate and outermost shells. The synthesized C/6S UCNPs emit blue, green, and red light under 980, 800, and 1532 nm, respectively. Importantly, by combining incident near-infrared (NIR) light with various wavelengths (800, 980, and 1532 nm), full-color UCL including blue, cyan, green, yellow, orange, red, purple, and white UCL is achieved from the single C/6S UCNP composition. The color gamut obtained from the C/6S UCNPs shows 101.6% of the sRGB standard color gamut. Furthermore, transparent C/6S UCNP-polydimethylsiloxane (PDMS) composite is prepared. Full-color display realized in the transparent C/6S UCNP-PDMS composite indicates the feasibility of constructing the C/6S UCNP-based three-dimensional volumetric displays with wide color gamut.

Ultrasensitive Thermochromic Upconversion in Core–Shell–Shell Nanoparticles for Nanothermometry and Anticounterfeiting

“…We prepared the control sample of NaYF 4 :Yb 3+ /Er 3+ /Ce 3+ @NaYF 4 :Yb 3+ /Tm 3+ core–shell nanoparticles, and their upconversion emission intensity was indeed reduced by comparison to the sample having the interlayer (Figure S6). This requirement is similar to that of the nanostructure systems for orthogonal upconversion. − Also, this control sample only generates a small S r value (Figure S6h). It should be noted that a 3.49 nm interlayer is thick enough to minimize the cross talk between two upconversion layers (Figures S7 and S8).…”

Tailoring Lanthanide Upconversion Luminescence through Material Designs and Regulation Strategies

“…Efforts from other groups have also been dedicated to orthogonal UCNPs synthesis and applications, with similar core-multishell UCNPs design, where two optical centers were separated by an inert shell layer. [25][26][27][28][29][30][31] Recently, some researchers have developed orthogonal UCNPs with fewer shells. In this case, Huang and colleagues prepared an orthogonal UCNP with a core-shell-shell design by avoiding the Nd 3+ as the 808 nm sensitizer.…”

Switching the NIR upconversion of nanoparticles for the orthogonal activation of photoacoustic imaging and phototherapy

“…This makes the manufacturing process quite complicated and time-consuming, and the instruments are also complex. Moreover, the tunable upconverting emissions mainly locate in the UV-visible region, such as UV/blue 32 , green/red (or blue) 33 , 34 and blue/green/red light 17 , 27 , 35 , 36 . The switchable NIR emission is still not achievable, which is believed to be more significant in the phototheranostics.…”