NIR triggered NaYF4:Yb3+, Tm3+@NaYF4/CsPb(Br1-x/Ix)3 composite for up-converted white-light emission and dual-model anti-counterfeiting applications. (March 2022)

• Record Type: Journal Article
• Authors: Naresh, V.; Adusumalli, V.N.K.B.; Park, Y.I.; Lee, N.
• Is Part Of: Materials today chemistry. Volume 23(2022)
• Publication Date: 2022-03
• Subjects: NaYF4:Yb, Tm@NaYF4 NPs -- CsPb(Br1-x/Ix)3 PeNCs -- Up-conversion luminescence -- Down-conversion luminescence -- NIR triggerd white light-emission -- Dual-model luminescence -- Anti-counterfeiting; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2021.100752
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Assembling nanomaterials from two classes with exceptional control at the nanoscale can lead to new nanohybrids with novel properties. Here, we report the tunable up-conversion luminescence properties of CsPb(Br1- x /I x )3 perovskite nanocrystals (PeNCs) sensitized by NaYF4 :Yb, Tm@NaYF4 up-conversion nanoparticles (UCNPs) at 980 nm excitation. The up-conversion luminescence of NaYF4 :Yb 3+, Tm 3+ @NaYF4 /CsPb(Br1- x /I x )3 composite demonstrates that the radiative photon reabsorption process is accountable for the UC energy transfer from excited levels of Tm 3+ -based UCNPs to PeNCs. The long-lived Tm 3+ states feed PeNCs carriers with intrinsic lifetimes extending from nanoseconds to microseconds. By varying the UCNPs/PeNCs concentration ratio, the NaYF4 :Yb 3+, Tm 3+ @NaYF4 /CsPb(Br0.55 I0.45 )3 composite generates UC white light emission. The near-infrared excited white light-emitting devices are more compatible with human tissues than blue light-excited ones. Therefore, the prototype of UC white light-emitting diode is developed by coupling the UCNPs/PeNCs composite coated glass plate onto a commercial 940 nm-light-emitting diode chip. To overcome the counterfeiting risk that arises in the case of a single fluorescence mode, we developed a simple dual-model strategy based on manipulation of UC and down-conversion luminescence in anti-counterfeiting under 980 nm and 365 nm excitation, which makes it difficult to encrypt the information. In addition, the UCNPs/PeNCs composite exhibited better photostability under near-infrared illumination, retaining 85% of initial photoluminescence intensity, solving the problem of photo-instability. Graphical abstract: Highlights: NaYF4 :Yb 3+, Tm 3+ @NaYF4 up-conversion nanoparticles (UCNPs)-sensitized CsPb(Br1- x /I x )3 perovskite nanocrystals (PeNCs) exhibit color-tunable photon UC emission at 980 nm. Radiative energy transfer from UCNPs to PeNCs is responsible for UC emission. UC white light emission is achieved from UCNPs-sensitized PeNCs under 940 nm light-emitting diode. Under ultraviolet(UV) and near-infrared(NIR) illuminations, dual-model anti-counterfeiting patterns are visualized. The UCNPs/PeNCs composite exhibited exceptional photostability when exposed to NIR light rather than UV light.