Park, Bong Je Hong, A-Ra Park, Suntak Kyung, Ki-Uk Lee, Kwangyeol Jang, Ho Seong 2024-01-20T01:34:26Z 2024-01-20T01:34:26Z 2021-09-01 2017-04-03 2045-2322 https://pubs.kist.re.kr/handle/201004/122859 Core/shell (C/S)-structured upconversion nanophosphor (UCNP)-incorporated polymer waveguidebased flexible transparent displays are demonstrated. Bright green-and blue-emitting Li(Gd, Y) F-4: Yb, Er and Li(Gd, Y) F-4: Yb, Tm UCNPs are synthesized via solution chemical route. Their upconversion luminescence (UCL) intensities are enhanced by the formation of C/S structure with LiYF4 shell. The Li(Gd, Y) F-4: Yb,Er/LiYF4 and Li(Gd, Y) F-4: Yb, Tm/LiYF4 C/S UCNPs exhibit 3.3 and 2.0 times higher UCL intensities than core counterparts, respectively. In addition, NaGdF4: Yb, Tm/NaGdF4: Eu C/S UCNPs are synthesized and they show red emission via energy transfer and migration of Yb3+-> Tm3+-> Gd3+-> Eu3+. The C/S UCNPs are incorporated into bisphenol A ethoxylate diacrylate which is used as a core material of polymer waveguides. The fabricated stripe-type polymer waveguides are highly flexible and transparent (transmittance > 90% in spectral range of 443-900 nm). The polymer waveguides exhibit bright blue, green, and red luminescence, depending on the incorporated UCNPs into the polymer core, under coupling with a near infrared (NIR) laser. Moreover, patterned polymer waveguide-based display devices are fabricated by reactive ion etching process and they realize bright blue-, green-, and red-colored characters under coupling with an NIR laser. English NATURE PUBLISHING GROUP LANTHANIDE-DOPED NANOCRYSTALS CORE-SHELL NANOPARTICLES IN-VIVO OPTICAL-PROPERTIES ENERGY MIGRATION SOLID-STATE LIGHT LUMINESCENCE COMPOSITES NANOPROBES Flexible transparent displays based on core/shell upconversion nanophosphor-incorporated polymer waveguides Article 10.1038/srep45659 1 SCIENTIFIC REPORTS, v.7 SCIENTIFIC REPORTS 7 scie scopus 000398239600001 2-s2.0-85016983622 Multidisciplinary Sciences Science & Technology - Other Topics Article LANTHANIDE-DOPED NANOCRYSTALS CORE-SHELL NANOPARTICLES IN-VIVO OPTICAL-PROPERTIES ENERGY MIGRATION SOLID-STATE LIGHT LUMINESCENCE COMPOSITES NANOPROBES upconversion transparent displays flexible displays nanophospohrs core/shell