首页|Dual-emitting ZIF-8＞4-MU@Zn2GeO4:Mn~(2+)nanocomposites for ratiomertic luminescent thermometer and information encryption
Dual-emitting ZIF-8＞4-MU@Zn2GeO4:Mn~(2+)nanocomposites for ratiomertic luminescent thermometer and information encryption
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NSTL
Dual-emitting ratiometric optical thermometers with the advantages of excellent self-calibration and high-sensitivity have become a research hot spot.Herein,a dual-emissive 4-methylumbelliferone encapsulated ZIF-8(ZIF-8d4-MU)modified Zn2GeO4:Mn~(2+)nanocomposite was simply prepared by adding Zn2GeO4:Mn~(2+)nano-rods into a methanol solution containing 4-methylumbelliferone(4-MU),zinc(II)nitrate hexahydrate,and 2-methylimidazole.Accompanying with the self-assembly of ZIF-8d4-MU,the binding affinity of Zn~(2+)ions to the surface of Zn2GeO4:Mn~(2+)nanorods enables the formation of ZIF-8D4-MU@Zn2GeO4:Mn~(2+)nanocomposite.The photoluminescence violet-blue(420 nm)and green emissions(531 nm)of the nanocomposite can be ascribed to the two independent luminescent centers of 4-MU dyes confined in ZIF-8 and the characteristic transition of 4T1-6A1 for Mn~(2+)ions doped in Zn2GeO4,respectively.The fluorescent intensity ratios(FIRs)of 4-MU to Mn~(2+)(I _(420)nm/I_(531)nm)showed excellent self-calibrating temperature monitoring functions with a maximum relative sensitivity(Sr)of 1.82%-℃_1 and stable reusability in the temperature range of 20-100 ℃.Also,the ZIF-8>4-MU@Zn2GeO4:Mn~(2+)hybridized polyvinyl alcohol(PVA)transparent film showed a similar multi-emitting behavior,as well as good processability and tensile properties.Benefiting from the excitation-dependent emitting property of ZIF-8>4-MU@Zn2GeO4:Mn~(2+),a multiple optical encryption of digital information was successfully realized based on a two-dimensional code,achieving an enhanced security level for preventing counterfeiting.This proof-of-concept study offers a feasible assembled way in fabricating multi-mode luminescent nanocomposites for ratiometric temperature sensing and information encryption.
Zn2GeO4:Mn~(2+)Dual-emissionRatiometric thermometerEncryption information
Zishuo Yi、Weiling Huang、Yan Xu
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Department of Chemistry,College of Sciences,Northeastern University,Shenyang,Liaoning,110819,China
NSTL
