CN112159654A - 一种蓝光激发的铜基杂化发光半导体材料及其应用 - Google Patents
一种蓝光激发的铜基杂化发光半导体材料及其应用 Download PDFInfo
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Abstract
本发明公开了一种零维蓝光激发铜基无机‑有机杂化发光半导体材料及其制备方法。所述的发光半导体分子结构式为Cu6(BPT)6，该材料表现为有机配体和无机组分通过配位键相连的杂化零维齿轮状结构。具体结构特征为三铜离子与三个有机配体的硫原子交替连接形成六元环，环中铜离子分别与另外三个有机配体中氮原子形成配位键，每个有机配体以桥联的作用将两个六元环平行固定，其中带有溴基基团的有机配体以锯齿状均匀的分布在六元环周围形成齿轮状结构。通过选择碘化亚铜，5‑溴‑2‑巯基吡啶，碘化钾，水，乙腈和氢碘酸为反应原料，在溶剂热的条件下获得了化合物Cu6(BPT)6的单晶，可以用于白光LED照明材料领域。
Description
技术领域
本发明涉及发光材料领域，尤其涉及一种铜基杂化发光半导体材料Cu6(BPT)6与其照明应用，其中BPT为5-溴-2-巯基吡啶。
背景技术
发光二极管（LED）形式的固态照明（SSL）技术利用半导体将电转换为光。白光LED作为一种新型绿色照明光源，具有低成本，能效高，寿命长，节能环保等诸多优点。这种光源已经普遍应用于显示屏，车灯，室内外照明等。白光LED将取代传统的照明光源，被认为是第四代固态照明光源，受到各国的广泛关注。
目前，利用LED芯片合成白光的方式主要有三种：(1)将RGB三基色LED芯片封装在一起。此方法虽然高效，但是成本高，发热严重，随着使用时间延长各LED芯片发光参数不容易控制一致。(2)利用近紫外光LED芯片激发与红光，绿光，蓝光三基色混合荧光粉来获取白光。这种方法成本较高，操作难度较大。(3)蓝光LED芯片配以黄色荧光粉(如YAG:Ce3+)，二者发出的光经过混合后形成白光。但这种方法获得的白光由于红光成分的缺失导致显色指数较低，色温较高。
因此，新型的LED芯片荧光粉既要实现高显色指数、低色温白光，又要低成本、无污染。蓝光LED芯片本身的蓝光加上蓝光激发红光和绿光构成三基色即可获得白光，不仅有红光成分的补充来调节显色指数和色温，同时减少混合荧光粉组分降低操作难度。发光金属基杂化材料是一类具有广阔应用前景的材料。其中铜基杂化发光半导体材料由于性质稳定，原料廉价易得，合成条件温且光致发光性能优异，一直以来受到众多研究者的关注。
当前，白光LED荧光粉材料完全依赖稀土（RE）元素，而稀土元素可能面临严重的供应短缺，并且缺乏可回收性对环境具有破坏性。本发明中以碘化亚铜作为反应物与有机配体相结合构成零维金属有机杂化发光半导体材料，属于非稀土无污染有机金属半导体材料；该材料最适激发波长460nm蓝光激发发射红光，并且展现出优异的光致发光性能，在发光照明材料研究领域具有重要价值。
发明内容
本发明的目的在于提供一种白光LED用铜基杂化红色发光半导体材料；克服现阶段稀土元素发光材料成本高以及稀土元素发光材料在合成和环境友好等方面的缺点，同时最佳激发波长匹配标准蓝光芯片，大大降低白光LED器件制作难度，且具有良好的光致发光性能。
本发明的技术方案包括以下内容：
1. 一种零维铜基无机-有机杂化红色发光半导体材料Cu6(BPT)6，式中的BPT表示5-溴-2-巯基吡啶。该化合物为单斜晶系，结晶于C2/c空间群，单胞参数为a = 23.6 (2) Å，b= 9.5 (2) Å，c = 18.9 (2) Å，α = 90 º，β = 93.5 (3) º，γ = 90 º；材料的晶体颜色为橘黄色，该材料表现为有机配体和无机(Cu6)核通过配位键相连的杂化零维摩天轮状结构；具体结构特征为六个铜离子与六个BPT配体的硫原子交替连接形成两个(Cu3S3)六元环；每个有机配体再以桥联的方式将两个六元环平行固定，呈现出BPT配体均匀地分布在两个六元环周围形成摩天轮状结构。
2. 如项1所述的零维铜基无机-有机杂化发光半导体材料的制备方法，其特征在于：称取摩尔比为4：5：20的碘化亚铜、5-溴-2-巯基吡啶和碘化钾，溶于体积比为3：3：1的水、乙腈和氢碘酸混合液，在溶剂热条件下可得橘黄色晶态产物，即为Cu6(BPT)6。
3. 如项1所述的铜基无机-有机杂化发光半导体材料的用途，其特征在于：该杂化物具有最适460nm蓝光激发且展现出优异的光致发光性能，作为一种白光LED发光材料的备选材料。
本发明的有益效果为产物的合成条件简单、易控且无污染；材料的光致发光性能优异且稳定性高，可用作白光LED器件的制作。
附图说明
图1为无机-有机杂化发光半导体Cu6(BPT)6的分子结构图，忽略氢原子。
图2为无机-有机杂化发光半导体Cu6(BPT)6分子在单胞内沿b轴的空间堆积图，忽略氢原子。
图3为无机-有机杂化发光半导体Cu6(BPT)6刚合成的粉末衍射花样，均与单晶模拟衍射结果完全吻合。
图4为无机-有机杂化发光半导体Cu6(BPT)6的红外光谱图。
图5为无机-有机杂化发光半导体Cu6(BPT)6的能带间隙图。
图6为无机-有机杂化发光半导体Cu6(BPT)6的荧光激发发射光图。
图7为无机-有机杂化发光半导体Cu6(BPT)6的光致发光色坐标。
图8为无机-有机杂化发光半导体Cu6(BPT)6制成的白光LED发光器件。
图9为无机-有机杂化发光半导体Cu6(BPT)6制成的白光LED发光光谱图。
图10为无机-有机杂化发光半导体Cu6(BPT)6制成的白光LED发光色坐标。
具体实施方式
（1）化合物Cu6(BPT)6的合成
将0.038 g CuI、0.249 g KI和0.47 g 5-溴-2-巯基吡啶放入25 mL的聚四氟乙烯内胆中的聚全氟乙丙烯反应袋中，加入1 mL 氢碘酸、3 mL水、3 mL乙腈，然后聚四氟乙烯内胆放入不锈钢反应釜中，旋紧后放在140 ℃烘箱的加热，并在此温度下恒温三天，然后冷却至室温，经过乙醇洗涤后得到橘黄色块状晶体，即为化合物Cu6(BPT)6。在上述的反应条件下得到的晶体的纯度、产率较高。
（2）白光LED发光器件的制作
将充分研磨的Cu6(BPT)6粉末以及商用绿粉(Sr, Ba)2SiO4:Eu (发射525nm)和商用AB胶水混合调制后，与蓝色LED芯片封装，获得白光发射的LED器件，可作为白光光源应用于照明设备。
Claims (2)
1. 一种具有光致发光性能的零维铜基无机-有机杂化发光半导体材料，其特征在于：该杂化材料的结构式为Cu6(BPT)6，式中的BPT表示5-溴-2-巯基吡啶；所述的铜基杂化发光半导体材料结晶于单斜晶系，C2/c空间群，单胞参数为a = 23.6 (2) Å，b = 9.5 (2) Å，c= 18.9 (2) Å，α = 90 º，β = 93.5 (3) º，γ = 90 º；材料的晶体颜色为橘黄色，该材料表现为有机配体和无机(Cu6)核通过配位键相连的杂化零维摩天轮状结构；具体结构特征为六个铜离子与六个BPT配体的硫原子交替连接形成两个(Cu3S3)六元环；每个有机配体再以桥联的方式将两个六元环平行固定，呈现出BPT配体均匀地分布在两个六元环周围形成摩天轮状结构。
2.一种权利要求1所述的零维铜基无机-有机杂化发光半导体材料的用途，其特征在于：该杂化发光半导体材料可被460 nm的蓝光有效激发且展现出优异的光致发光性能，与绿色荧光粉调制，基于蓝光LED芯片制备高效白光LED器件。
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| CN113201328A (zh) * | 2021-04-12 | 2021-08-03 | 华中科技大学 | 一种单基质双带白光发射材料及其制备方法与应用 |
| CN113999168A (zh) * | 2021-10-22 | 2022-02-01 | 济南大学 | 一种有机修饰的铜硫二维半导体材料及应用 |
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