Fabrication of Flexible White Light-Emitting Diodes from Photoluminescent Polymer Materials with Excellent Color Quality

• DOI: 10.1021/acsami.7b03386
• Publication Date: 2017-09-11T12:11:06Z
• Authors: Huang-Yu Lin; Chin-Wei Sher; Chih-Hao Lin; Hsien-Hao Tu; Xin Yin Chen; Yi-Chun Lai; Chien-Chung Lin; Huang-Ming Chen; Peichen Yu; Hsin-Fei Meng; Gou-Chung Chi; Keiji Honjo; Teng-Ming Chen; Hao-Chung Kuo
• Keywords: Quantum dots; Light-emitting diode; Flexible device; Polyfluorene; Color-rendering index; 7. Clean energy; 01 natural sciences; 0104 chemical sciences

This study developed flexible light-emitting diodes (LEDs) with warm white and neutral white light. A simple ultraviolet flip-chip sticking process was adopted for the pumping source and combined with polymer and quantum dot (QD) films technology to yield white light. The polymer-blended flexible LEDs exhibited higher luminous efficiency than the QD-blended flexible LEDs. Moreover, the polymer-blended LEDs achieved excellent color-rendering index (CRI) values (Ra = 96 and R9 = 96), with high reliability, demonstrating high suitability for special applications like accent, down, or retrofit lights in the future. In places such as a museum, kitchen, or surgery room, its high R9 and high CRI characteristics can provide high-quality services.