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最新MOF | 郑州大学宋继中&姚纪松Angew:铅基MOF工程助力纯红相 CsPbI₃钙钛矿量子点发光二极管效率突破30%

  • 2026-05-09 12:09:15
最新MOF | 郑州大学宋继中&姚纪松Angew:铅基MOF工程助力纯红相 CsPbI₃钙钛矿量子点发光二极管效率突破30%

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一句话总结

郑州大学宋继中教授、姚纪松博士采用铅基 MOF(Pb-MOF) 调控量子点生长,原位释放强配位配体 MMA 实现高效表面钝化,制备出窄线宽、高导电、高稳定的 CsPbI₃量子点,最终获得 EQE 30.8%、半寿命 140.6 h 的纯红 QLED。相关工作发表在Angewandte Chemie International Edition

研究背景

CsPbI₃量子点是满足 Rec. 2020 标准纯红发光的理想材料,但尺寸不均导致色纯度差、绝缘配体阻碍载流子传输,难以兼顾高效率、窄线宽与长寿命。

实验方法

  • 采用改进热注射法合成 CsPbI₃量子点,引入 Pb-MOF 作为配体库与生长调控剂;

  • 结合TEM、NMR、FTIR、XPS表征量子点形貌、表面配体与成键方式;

  • 通过DFT 理论计算验证 MMA 与 Pb²⁺的强相互作用;

  • 测试PLQY、TRPL、SCLC、导电性、UPS/KPFM表征光电特性;

  • 制备 QLED 器件,测试EL 光谱、CIE 坐标、J–V–L、EQE、工作寿命等关键性能。

图文解析

图 1 MOF 调控合成单分散 CsPbI₃量子点

(a) 铅基 MOF 调控量子点合成的示意图;(b) 钙钛矿前驱体中不同配体与离子间的相互作用能;(c) 有无 Pb-MOF 条件下 CsPbI₃量子点的原位光致发光表征;(d) 对照组量子点(C-QDs)的透射电镜图(标尺:100 nm)与放大图(标尺:10 nm);(e) MOF 改性量子点(MOF-QDs)的透射电镜图(标尺:100 nm)与放大图(标尺:10 nm);(f) 对照组量子点与 MOF 改性量子点的尺寸分布统计。

图 2 MMA 配体与钙钛矿的键合作用

(a) 对照组量子点与 MOF 改性量子点的 ¹H 核磁共振谱;(b) 纯 MMA 配体及对应 CsPbI₃量子点的傅里叶变换红外光谱;(c–e) 对应量子点薄膜的高分辨 X 射线光电子能谱:Pb 4f、Cs 3d、S 2p;(f) MMA 配体在钙钛矿表面的吸附模型及对应形成能。

图 3 优化的光学与电子性能

(a) 量子点薄膜的光致发光光谱(插图为对应光致发光量子产率);(b) 对照组量子点与 MOF 改性量子点的时间分辨光致发光衰减曲线;(c) 基于对照组与 MOF 改性量子点的单电子器件空间电荷限制电流测试;(d) 量子点薄膜的电导率测试;(e–f) 对照组量子点与 MOF 改性量子点薄膜的导电原子力显微镜图;(g) 对照组与 MOF 改性量子点的紫外光电子能谱:二次电子截止区(左)、价带区(右);(h) 由紫外光电子能谱参数得到的对照组与 MOF 改性量子点的能级图(E_VAC:真空能级;E_F:费米能级);(i) 对照组量子点与 MOF 改性量子点薄膜的开尔文探针力显微镜图(标尺:2 μm)。

图 4 QLED 器件性能与工作稳定性

(a) QLED 器件结构示意图;(b) 不同偏压下基于 MOF 改性量子点的 QLED 电致发光光谱(插图为对应 CIE 色度坐标);(c) QLED 的电流密度–电压–亮度曲线;(d) QLED 的电流密度–外量子效率曲线(插图为大面积 QLED 实物图);(e) 27 个有无 Pb-MOF 器件的外量子效率统计直方图;(f) 本工作与近期报道的纯碘基纯红 QLED 的半高宽与外量子效率对比(包括准二维钙钛矿、纳米片、量子点);(g) 初始亮度约 100 cd m⁻²、恒定驱动电流下,基于 MOF 改性量子点的 QLED 电致发光峰位与半高宽演变;(h) 初始亮度 100 cd m⁻² 下 QLED 的工作寿命。

文章总结

本文提出Pb-MOF 介导合成策略,利用 MOF 缓慢释放的多齿配体 MMA,通过双端强配位作用牢牢锚定 CsPbI₃量子点表面的 Pb²⁺,实现三重核心突破:

  1. 抑制量子点不均生长,获得 **<5 nm、半高宽仅 31 nm** 的近单分散量子点;

  2. 大幅降低缺陷、提升薄膜电导率至 1.3×10⁻⁴ S m⁻¹,载流子传输显著改善;

  3. 器件实现634 nm 纯红发光、CIE (0.70, 0.30)、覆盖 98.5% Rec. 2020 色域,外量子效率达30.8%,100 cd m⁻² 下半寿命140.6 h(为对照组 15 倍)。该工作同步解决小尺寸 CsPbI₃量子点的尺寸分散、缺陷态、绝缘配体三大瓶颈,为超高画质显示用纯红钙钛矿 QLED 提供可规模化的高效路线。

📜 文章链接:

https://doi.org/10.1002/anie.202643735

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  1. CONNECT:[ UseTime:0.000435s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000555s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000392s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000303s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000549s ]
  6. SELECT * FROM `set` [ RunTime:0.000250s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000580s ]
  8. SELECT * FROM `article` WHERE `id` = 530676 LIMIT 1 [ RunTime:0.006020s ]
  9. UPDATE `article` SET `lasttime` = 1778500704 WHERE `id` = 530676 [ RunTime:0.000933s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000250s ]
  11. SELECT * FROM `article` WHERE `id` < 530676 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005203s ]
  12. SELECT * FROM `article` WHERE `id` > 530676 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003504s ]
  13. SELECT * FROM `article` WHERE `id` < 530676 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000935s ]
  14. SELECT * FROM `article` WHERE `id` < 530676 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003120s ]
  15. SELECT * FROM `article` WHERE `id` < 530676 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003300s ]
0.124943s