A fully π-conjugated triazine-based 2D covalent organic framework used as metal-free yellow phosphors in white light-emitting diodes

IF 6.3 2区化学 Q1 POLYMER SCIENCE

European Polymer Journal Pub Date : 2023-04-03 DOI:10.1016/j.eurpolymj.2023.111887

Long Gao , Wenyao Li , Huaijun Tang , Jing Qin , Shiyou Lu , Meifang Zhang , Kaixin Yang , Yuxiang Jiao

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引用次数: 2

Abstract

Luminescent covalent organic frameworks (COFs) can be used as metal-free phosphors to replace rare earth-based phosphors for LEDs. Here, a fully π-conjugated 2D COF containing triazine units is synthesized via Knoevenagel condensation by using terephthalaldehyde (TPA) and 2,2′,2′'-((1,3,5-triazine-2,4,6-triyl)tris([1′',1′''-biphenyl]-4′,4′'-diyl))triacetonitrile (TTTA) as monomers. This yellow-emitting COF consists of a periodic hexagonal pore structure and is in an eclipsed (AA) stacking mode. Its solid-state photoluminescence quantum yield (PLQY) is 26.0 %, its thermal decomposition temperature (T_d) is ca. 495 °C, and its relative emission intensity at 90 ℃ is 80.0 % of that at 30 °C, at 150 ℃ is 58.9 % of that at 30 °C. Together with GaN-based blue-emitting chips (λ_em,max ≈ 460 nm, around 25.0 lm·W⁻¹), a series of cold/neutral/warm white LEDs are fabricated by using the COF as yellow phosphors at different concentrations in epoxy resin. At 2.0 wt%, a cold white LED is obtained with the best performances, its correlated color temperature (CCT) is 5743 K, color rendering index (CRI) is 83.1, Commission Internationale de L’Eclairage (CIE) chromaticity coordinate is (0.33, 0.29), luminous efficacy (LE) is 18.18 lm·W⁻¹.

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一种全π共轭三嗪基二维共价有机骨架，在白光二极管中用作无金属黄色荧光粉

发光共价有机框架(COFs)可以作为无金属荧光粉取代稀土基荧光粉用于led。本文以对苯二甲酸(TPA)和2,2′，2′”-((1,3,5-三嗪-2,4,6-三基)三乙腈(TTTA)为单体，采用Knoevenagel缩合法合成了含三嗪单元的全π共轭二维COF。该发黄碳纳米管由周期性六边形孔结构组成，呈重叠(AA)堆叠模式。其固态光致发光量子产率(PLQY)为26.0%，热分解温度(Td)约为495℃，在90℃时的相对发射强度为30℃时的80.0%，在150℃时为30℃时的58.9%。结合氮化镓基蓝光发光芯片(λem,max≈460 nm，约25.0 lm·W−1)，在环氧树脂中以不同浓度的COF作为黄色荧光粉制备了一系列冷/中性/暖白光led。在2.0 wt%时，获得了性能最佳的冷白光LED，其相关色温(CCT)为5743 K，显色指数(CRI)为83.1，国际照明委员会(CIE)色度坐标为(0.33,0.29)，光效(LE)为18.18 lm·W−1。

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来源期刊

European Polymer Journal 化学-高分子科学

CiteScore

9.90

自引率

10.00%

发文量

691

审稿时长

23 days

期刊介绍： European Polymer Journal is dedicated to publishing work on fundamental and applied polymer chemistry and macromolecular materials. The journal covers all aspects of polymer synthesis, including polymerization mechanisms and chemical functional transformations, with a focus on novel polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine. The main scope is covered but not limited to the following core research areas: Polymer synthesis and functionalization • Novel synthetic routes for polymerization, functional modification, controlled/living polymerization and precision polymers. Stimuli-responsive polymers • Including shape memory and self-healing polymers. Supramolecular polymers and self-assembly • Molecular recognition and higher order polymer structures. Renewable and sustainable polymers • Bio-based, biodegradable and anti-microbial polymers and polymeric bio-nanocomposites. Polymers at interfaces and surfaces • Chemistry and engineering of surfaces with biological relevance, including patterning, antifouling polymers and polymers for membrane applications. Biomedical applications and nanomedicine • Polymers for regenerative medicine, drug delivery molecular release and gene therapy The scope of European Polymer Journal no longer includes Polymer Physics.