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학술지 Flexible Transparent Displays Based on Core/Shell Upconversion Nanophosphor-incorporated Polymer Waveguides
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박봉제, 홍아라, 박선택, 경기욱, 이광열, 장호성
Scientific Reports, v.7, pp.1-11
Nature Publishing Group
17ZS1100, 투명소자 및 UX 기술 연구, 경기욱
Core/shell (C/S)-structured upconversion nanophosphor (UCNP)-incorporated polymer waveguide-based flexible transparent displays are demonstrated. Bright green-and blue-emitting Li(Gd,Y)F4:Yb,Er and Li(Gd,Y)F4: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)F4:Yb,Er/LiYF4 and Li(Gd,Y)F4: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+ ?넂 Tm3+ ?넂 Gd3+ ?넂 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.
KSP 제안 키워드
Bisphenol a, C/S structure, Chemical route, Core material, Coupling with, Display device, Energy Transfer, Highly flexible, NIR laser, Near-Infrared(NIR), Reactive ion etching(RIE)