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华中科技大学罗家俊&南京理工大学徐勃AM:双锚定自组装单分子层实现高效碘化铜团簇基发光二极管

  • 2026-04-23 00:32:46
华中科技大学罗家俊&南京理工大学徐勃AM:双锚定自组装单分子层实现高效碘化铜团簇基发光二极管

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通讯作者:华中科技大学罗家俊&南京理工大学徐勃  

基于无毒碘化铜纳米团簇(Cu NCs)的真空蒸镀型发光二极管(LED),在可规模化固态照明与显示领域具备巨大应用潜力。然而,对于这类有机–无机纳米团簇器件而言,界面缺陷引发的性能衰减仍是一项关键难题。

本文提出一种界面配位键钝化策略,采用含吡啶官能团、并经结构优化的吡啶锚定型自组装单分子层(SAM)材料。所设计的吡啶功能化 SAM 可同时钝化铜纳米团簇发光层(EML)并优化电荷注入。

基于该策略,我们制备的铜纳米团簇 LED 实现了22.5% 的峰值外量子效率(EQE)41 432 cd・m⁻² 的最大亮度,并在 1000 cd・m⁻² 亮度下将工作半寿命提升至119 小时,处于已报道蒸镀型团簇 LED 的最优水平之列。

此外,我们将铜纳米团簇 LED 与驱动电路集成,成功实现了有源矩阵显示屏。本研究凸显了分子工程化自组装单分子层在解锁高性能团簇 LED 中所发挥的关键作用。

图 1 兼具空穴传输与界面钝化功能的分子设计

(a)定向设计 SAM 分子 XS25 的合理策略示意图。该分子整合了三类功能单元:锚定基团(磷酸基 -PO (OH)₂)、空穴传输增强基团(咔唑)以及配位钝化基团(吡啶),可有效钝化 Cu 纳米团簇表面的铜空位缺陷。(b)4PACz 与 XS25 的静电势(ESP)分布图,颜色由蓝至红表示电子云密度逐渐降低。(c)通过密度泛函理论(DFT)计算得到的 4PACz 或 XS25 与 Cu 纳米团簇模型 [35DCzPPy]₃Cu₂I₂之间的结合能。原子配色:H— 白色,C— 灰色,O— 红色,N— 蓝色,P— 橙色,Cu— 粉色,I— 紫色。

图 2 基于 SAM 的团簇发光层(EML)光电性能提升与形貌表征

(a)ITO/XS25/EML(10 nm)薄膜在不同光电子出射角(θ = 0°、25°、50°、70°)下的 Cu 2p 轨道角分辨 X 射线光电子能谱(ARXPS)。增大出射角 θ 可提升表面灵敏度,使能谱更贴近 XS25/EML 界面的化学态信息。(b)4PACz(绿线)与 XS25(蓝线)薄膜的光致发光(PL)光谱。(c)纯 EML 及不同 SAM 修饰 EML 的时间分辨光致发光(TRPL)衰减曲线。粉色为裸 ITO 基底上的 EML,绿色为 4PACz 修饰,蓝色为 XS25 修饰。曲线采用双指数衰减模型拟合。(d, e)宽场高光谱 PL 成像提取的 (50 × 50 µm²) PL 峰强度分布图:(d)ITO/4PACz/EML;(e)ITO/XS25/EML。测试采用 340 nm 激发,100 倍物镜,步长 0.2 µm,单像素积分时间 5 ms。色标代表强度计数,范围 350(棕色)至 600(绿色)。(f)单空穴器件的空间电荷限制电流(SCLC)特性(有效面积 0.04 cm²)。J–V 曲线定量对比了 4PACz 与 XS25 作为中间层时 EML 的缺陷态密度。陷阱填充极限电压(VTFL)由 1.44 V(4PACz)降至 0.85 V(XS25)。

图 3 SAM 修饰界面的空穴注入机理研究

(a)由紫外光电子能谱(UPS)测得的 4PACz、XS25 与 35DCzPPy 的最高占据分子轨道(HOMO)能级图,以真空能级为参考。EF 和 EVAC 分别代表费米能级与真空能级。(b, c)开尔文探针力显微镜(KPFM)表面接触电势分布图:(b)ITO/4PACz;(c)ITO/XS25。(d)XS25 粉末与 ITO/XS25 薄膜的傅里叶变换红外光谱(FTIR)。(e, f)ITO 基底上 XS25 的角分辨 XPS 谱:(e)O 1s;(f)P 2p。

图 4 采用不同 SAM 的 Cu 纳米团簇 LED 器件性能与工作稳定性

(a)搭载不同 SAM 的 Cu 纳米团簇 LED 能级结构图。引入 XS25 后,空穴向发光层注入的能级匹配更为合理。(b–d)不同 SAM 修饰的 Cu 纳米团簇 LED 性能曲线:(b)电流密度–电压;(c)亮度–电压;(d)外量子效率(EQE)–亮度曲线。(e)XS25 基器件在不同驱动电压下的电致发光(EL)光谱,发射峰稳定在 540 nm。(f)XS25 基 LED 在不同初始亮度下的亮度衰减曲线(L₀ = 10201、4700、3369、1256、1000、800 cd・m⁻²)。(g)工作半寿命 T50 与亮度的拟合曲线,在 L₀ = 100 cd・m⁻² 下拟合得到 T50 = 5495 h。(h)金属卤化物基器件的 EQE 与工作稳定性(T50@100 cd・m⁻²)统计对比图。红色五角星为本文工作;黑色倒三角为热蒸镀稀土卤化物 LED;紫色三角为热蒸镀钙钛矿 LED;绿色方块为热蒸镀 Cu 纳米团簇 LED;蓝色圆点为溶液法 Cu 纳米团簇 LED。(i)基于 XS25 的 Cu 纳米团簇 LED 原型面板展示,体现其在高分辨率显示领域的实际应用潜力。器件发出黄光,主要源于半透明电极的波长依赖透过率与微腔效应。

原文:https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adma.202522698?saml_referrer

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28%!倒置钙钛矿太阳能电池低温创纪录效率!(保持单位:陕师大赵奎&牛天启)

宽带隙钙钛矿25.03%(1.68 eV)!(保持单位:中国科学院半导体所游经碧&蒋琦)

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碳基倒置钙钛矿太阳能电池21.8%效率保持单位:亥姆霍兹埃尔兰根-纽伦堡可再生能源研究所 (HI ERN) Christoph J. Brabec & Tian Du

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  1. CONNECT:[ UseTime:0.000662s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001084s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000363s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000303s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000601s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000711s ]
  8. SELECT * FROM `article` WHERE `id` = 520241 LIMIT 1 [ RunTime:0.000511s ]
  9. UPDATE `article` SET `lasttime` = 1777045071 WHERE `id` = 520241 [ RunTime:0.000703s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 520241 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000466s ]
  12. SELECT * FROM `article` WHERE `id` > 520241 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000391s ]
  13. SELECT * FROM `article` WHERE `id` < 520241 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000671s ]
  14. SELECT * FROM `article` WHERE `id` < 520241 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001064s ]
  15. SELECT * FROM `article` WHERE `id` < 520241 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000694s ]
0.080129s