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【Angew】深圳大学杨楚罗/曹啸松团队:协同调控三重态密度与重原子效应,构筑超低效率滚降的窄谱带纯绿OLEDs

  • 2026-06-13 00:56:28
【Angew】深圳大学杨楚罗/曹啸松团队:协同调控三重态密度与重原子效应,构筑超低效率滚降的窄谱带纯绿OLEDs
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在有机发光二极管(OLED)中,三重态能否被高效利用,直接决定器件效率和高亮度下的效率稳定性。热活化延迟荧光(TADF)为纯有机体系提供了有效的三重态回收路径,其中反向系间窜越(RISC)速率常数kRISC是衡量三重态利用能力的关键参数。传统D-A型TADF材料虽然常具备较快的RISC,但其长程电荷转移特征往往会导致发射谱变宽,难以兼顾高色纯度显示需求。
多重共振热激活延迟荧光(MR-TADF)材料因具有短程电荷转移特征,能够同时实现高发光效率和窄带发射,在超高清显示和BT.2020广色域应用中具有重要潜力。然而,其刚性平面骨架虽有利于保持窄带发射,也限制了发射向绿光及更长波长区域拓展。特别是在高色纯绿光体系中,常用的共轭扩展策略虽可推动发射红移,却往往伴随单三重态能级差增大和 RISC 变慢,从而加剧效率滚降。
从机理上看,RISC受激发态能级匹配和自旋-轨道耦合共同影响。近年来,提高RISC主要依赖两类策略:一是利用重原子效应增强自旋-轨道耦合,二是增加三重态密度以拓宽RISC通道。但前者易引起结构弛豫增强和发射谱展宽,后者又常因耦合不足而难以进一步提升。因此,如何在纯有机 MR-TADF 体系中同时实现超快RISC 与本征窄带发射,仍是该领域亟待解决的关键问题。

图1:分子设计策略及分子结构

近日,深圳大学杨楚罗/曹啸松团队提出了一种协同调控三重态密度和重原子效应的分子设计策略。该设计并非简单通过重原子增强自旋-轨道耦合,而是通过对激发态能级结构的协同调控,在保持窄带发射特性的同时,提高与S1能量接近的三重态对RISC的贡献,并利用硫原子的温和重原子效应进一步促进自旋翻转,最终实现三重态到单重态的高效快速转换。基于这一思路,含硫稠环单元CzS被引入多重共振骨架中,构建出CzS-BN。该分子在结构上同时实现了三方面优化:一是延长π共轭,将发射有效推进至纯绿光区域;二是在  附近引入更多具有局域激发特征的三重态,显著提高可参与RISC的三重态密度;三是利用硫原子的重原子效应增强自旋–轨道耦合。在这种“态密度调控+自旋耦合增强”的协同作用下,CzS-BN在保持MR材料窄谱带发射优势的同时,获得了超快的KRISC。基于该分子的非敏化OLED器件不仅获得了优异的外量子效率,还在高亮度下表现出显著降低的效率滚降,展现出兼具高色纯度、高效率与低效率滚降的综合优势。

图2:理论计算

为验证上述设计策略,作者构建了四个发光材料,用以区分三重态密度和重原子在调控反向系间窜越(RISC)过程中的各自作用。一,采用稠合与非稠合给体片段调控局域激发(LE)态能量,进而调节三重态的密度;二,以硫或氧作为硫属杂原子,在尽量减小对前线轨道扰动的前提下调控自旋–轨道耦合(SOC)。其中,CzS-BN 代表“双重调控”体系;而 DPS-BN(非稠合给体,含硫)、DPO-BN(非稠合给体,含氧)以及 CzO-BN(稠合给体,含氧)则分别作为沿两条设计维度设置的逻辑对照分子。

计算的激发态性质表明,该系列分子的 TADF 行为并不单纯由Δ𝐸ST决定,还受到S1 附近三重态密度及各S1−T𝑛 通道SOC强度的共同调控。对于 DPO-BN 和 DPS-BN,仅有两个三重态(T1 和 T2)位于热可及窗口内(能级差<0.3 eV);空穴–电子分析表明,这两个态均以短程电荷转移(SR-CT)特征为主,而更高能级三重态由于能量过高,对 RISC 的贡献可以忽略。相比之下,CzO-BN 和 CzS-BN 在 S1 附近呈现出更致密的三重态分布,共有四个接近的三重态。对于这两个稠合给体体系,T1和T2仍然保持SR-CT特征,而T3和T4则转变为局限于CzO/CzS片段的LE主导。

这种电子结构演化也体现在SOC上。两个含氧发光体 DPO-BN 和 CzO-BN的 S1-T1/T2耦合较弱,但在 CzO-BN 中,由于给体稠合,新增的 LE 型T3和T4 通道显著增强了SOC 。进一步将氧替换为硫后,三重态能级分布变化不大,但硫的重原子效应进一步放大了 SOC。尤其是 CzS-BN,同时兼具更高的三重态密度和更强的 SOC,因此在多个通道上都表现出更强耦合,说明轨道性质变化与温和重原子效应之间存在明显协同作用。

作者基于费米黄金定则和 Marcus 理论对 RISC 动力学进行了估算。总体 RISC 速率不仅包含直接的 T1-S1 通道,也考虑了经由高能级三重态参与的热激活间接通道,并对其贡献进行了玻尔兹曼加权。其中,CzS-BN表现出最高的 RISC 速率,主要归因于其同时具备更多三重态通道和更强的SOC,T3和T4通道对总速率贡献接近一半。总体来看,稠环结构提高了三重态密度,并进一步放大了硫原子对 SOC 的增强作用,从而实现了更高效的三重态利用。

图3:光物理测试结果
图4:电致发光器件性能
光物理结果表明,四个分子均具有典型 MR-TADF 材料的窄带绿光发射特征,发射峰位于 504–514 nm,半峰宽仅 17 nm。引入稠合给体后,发射进一步红移至纯绿区域,其中 CzO-BN 和 CzS-BN 的CIEy为0.73/0.74。CzS-BN的kRISC高达5.1×106 S-1。表明,提高三重态密度并增强自旋-轨道耦合可协同实现窄谱带发射与超快RISC。
器件测试显示,CzO-BN 和 CzS-BN 的电致发光已接近 BT.2020 纯绿标准,并在高亮度下保持稳定。其中,CzS-BN 器件综合性能最佳,最大 EQE、CE 和 PE 分别达到 34.6%、133.5 cd A−1、167.8 lm W-1,且在高亮度下仍保持较低效率滚降。其优异表现主要来源于超快 RISC 有效抑制三重态相关猝灭过程。
综上,该工作提出了一种“高三重态密度+适度重原子效应”的协同设计策略,在MR-TADF体系中有效兼顾了窄谱带发射与高效三重态利用,为构建高性能MR-TADF 材料提供了有效途径,也为下一代超高清显示OLED发光材料设计提供了新的设计思路。
相关成果以标题《Synergistic Modulation of Triplet Density and Heavy-Atom Effect Accelerates Reverse Intersystem Crossing for Narrowband Multi-Resonance TADF Emitters》发表于Angew. Chem. Int. Ed.深圳大学博士后杨明为论文第一作者,深圳大学杨楚罗讲席教授和曹啸松教授为共同通讯作者。该工作得到国家自然科学基金委、广东省基础与应用基础研究基金委员会、深圳市科技创新委员会的大力支持。
论文信息:
论文标题:Synergistic Modulation of Triplet Density and Heavy-Atom Effect Accelerates Reverse Intersystem Crossing for Narrowband Multi-Resonance TADF Emitters
论文链接:https://doi.org/10.1002/anie.4318204
作者:Ming Yang, Jiahui Liu, Cheng Zhong, Xiaosong Cao,* Zhanxiang Chen, Zhuixing Xue, Zeyuan Ye, Chuluo Yang*
课题组网站:https://opel.szu.edu.cn/
版权声明:我们注重分享,文章、图片、视频来自网络,版权归原作者,如有异议,请告知小编,我们会及时删除。

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  1. CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000764s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000337s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000461s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000636s ]
  8. SELECT * FROM `article` WHERE `id` = 578150 LIMIT 1 [ RunTime:0.000463s ]
  9. UPDATE `article` SET `lasttime` = 1781329055 WHERE `id` = 578150 [ RunTime:0.005673s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000326s ]
  11. SELECT * FROM `article` WHERE `id` < 578150 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000468s ]
  12. SELECT * FROM `article` WHERE `id` > 578150 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000557s ]
  13. SELECT * FROM `article` WHERE `id` < 578150 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006245s ]
  14. SELECT * FROM `article` WHERE `id` < 578150 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004071s ]
  15. SELECT * FROM `article` WHERE `id` < 578150 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009460s ]
0.101701s