Open AccessMulti‐Color Luminescence Transition of Upconversion Nanocrystals via Crystal Phase Control with SiO 2 for High Temperature Thermal Labels
Author(s) -
Baek Dahye,
Lee Tae Kyung,
Jeon Inkyu,
Joo Se Hun,
Shin Subeen,
Park Jaehyun,
Kang Seok Ju,
Kwak Sang Kyu,
Lee Jiseok
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202000104
Subject(s) - nanocrystal , luminescence , materials science , photon upconversion , phase transition , crystal (programming language) , phase (matter) , optoelectronics , thermal , chemical engineering , mineralogy , nanotechnology , chemistry , condensed matter physics , thermodynamics , organic chemistry , physics , computer science , engineering , programming language
Upconversion nanocrystals (UCNs)‐embedded microarchitectures with luminescence color transition capability and enhanced luminescence intensity under extreme conditions are suitable for developing a robust labeling system in a high‐temperature thermal industrial process. However, most UCNs based labeling systems are limited by the loss of luminescence owing to the destruction of the crystalline phase or by a predetermined luminescence color without color transition capability. Herein, an unusual crystal phase transition of UCNs to a hexagonal apatite phase in the presence of SiO 2 nanoparticles is reported with the enhancements of 130‐fold green luminescence and 52‐fold luminance as compared to that of the SiO 2 ‐free counterpart. By rationally combining this strategy with an additive color mixing method using a mask‐less flow lithography technique, single to multiple luminescence color transition, scalable labeling systems with hidden letters‐, and multi‐luminescence colored microparticles are demonstrated for a UCNs luminescence color change‐based high temperature labeling system.