当前位置:首页>深圳>深圳大学杨楚罗教授/胡宇轩助理教授AM:四苯基硅烷工程化MR-TADF用于高效率、长寿命且色域接近BT.2020标准的纯绿色OLED

深圳大学杨楚罗教授/胡宇轩助理教授AM:四苯基硅烷工程化MR-TADF用于高效率、长寿命且色域接近BT.2020标准的纯绿色OLED

  • 2026-05-09 14:14:56
深圳大学杨楚罗教授/胡宇轩助理教授AM:四苯基硅烷工程化MR-TADF用于高效率、长寿命且色域接近BT.2020标准的纯绿色OLED

实现优异的色纯度、高效率与长工作寿命的协同兼顾,对于不可或缺的有机发光二极管(OLED)而言,仍然是一个巨大的挑战,而OLED是实现超高清(UHD)显示的关键。最近,深圳大学杨楚罗教授/胡宇轩助理教授提出了一种合理的分子设计策略,通过在多共振热激活延迟荧光(MR-TADF)骨架的外围引入四苯基硅烷(TPS)和氘代TPS基团进行功能化修饰,以应对上述挑战。由此制备的p-DBFSi、 m-DBFSi和 m-DBFSi-d,表现出尖锐的绿色发光(515–517 nm),其半峰宽(FWHM)低至0.070 eV以下,跻身已报道的最窄绿色MR-TADF材料之列。采用m-DBFSi和m-DBFSi-d的OLED器件,实现了最纯净的绿光电致发光(CIEy =0.76)、高达40.1%和41.9%的非凡最大外量子效率(EQEmax),以及接近200 lm W−1的最大功率效率(PEmax),且无需额外使用敏化剂,使其跻身于最先进的窄带纯绿OLED行列。此外,基于 m-DBFSi-d的器件展现出显著增强的工作稳定性,在初始亮度为1000 cd m−2时,其工作寿命(LT80)长达2491小时。综上所述,这项工作建立了一种以TPS和氘代为核心的MR-TADF策略,使OLED能够同时实现超窄带发光、卓越效率与优异耐久性,为下一代UHD显示技术铺平了道路。

图1 分子设计思路

为实现纯绿光发射,采用了一种π-共轭扩展策略,将二苯并呋喃(DBF)单元嵌入到间位-二硼框架中,这有效地缩小了 Eg,并将发射波长蓝移至绿色光谱区域。为进一步调控发射曲线并增强分子稳定性,在硼原子的对位-引入TPS取代基,从而得到 p-DBFSi。同时,设计了异构体 m-DBFSi,其中三苯基硅基团连接在MR骨架的间位-位置,以优化空间拓扑结构,便于TPS的引入。这种结构修饰强化了四面体TPS单元提供的三维屏蔽效应,从而抑制分子堆积及有害的分子间相互作用。为进一步提升分子稳定性,简单合成了一种部分氘代类似物 m-DBFSi-d,通过引入氘代TPS基团实现。与碳氢类似物相比,该化合物的零点能(ZPE)降低且C─D键解离能(BDE)升高,有望抑制振动,减弱非辐射衰减,并加固分子骨架。综上所述,π-扩展、空间拓扑调控以及同位素取代的协同作用,旨在实现高效且运行稳定性更佳的超纯绿MR-TADF。

图2 光物理性质

p-DBFSim-DBFSim-DBFSi-d,在517515515 nm处出现尖锐的绿色发射峰,FWHM分别为15 nm0.067 eV)、14 nm0.065 eV)和14 nm0.064 eV)),是迄今为止报道的绿色MR-TADF发光体中最小的FWHM值。在3 wt%掺杂膜中,ΦPL值分别为96%99%99%。得益于更强的聚集抑制特性,m-DBFSim-DBFSi-d薄膜的光谱展宽显著减小,FWHM分别为17 nm0.078 eV)和17 nm0.076 eV)。并且m-DBFSim-DBFSi-dCIE坐标分别为(0.150.76)和(0.140.76),非常接近BT.2020绿色标准(0.170.80)。

图3 器件性能

p-DBFSim-DBFSim-DBFSi-d器件呈现出窄绿色电致发光,其峰值波长/半高宽值分别为520 nm/19 nm0.085 eV)、517 nm/17 nm0.080 eV)和517 nm/17 nm0.078 eV),并且m-DBFSim-DBFSi-d器件CIE坐标分别为(0.15, 0.76)(0.14, 0.76),接近BT.2020纯绿目标(0.17, 0.80)。得益于接近1ΦPL,以及高Θ//,基于m-DBFSim-DBFSi-d的器件实现了卓越的EL性能,它们的最大外量子效率(EQEmax)分别达到40.1%41.9%,并且实现了前所未有的最高功率效率(PE),接近200 lm W1,分别为187.5/191.8 lm W1。为了提升电致发光性能并增强器件稳定性,我们通过引入高效敏化剂构建了磷光敏化OLED。其初始亮度为1000 cd m2时,寿命LT80分别达到1421 hp-DBFSi)、2006 hm-DBFSi)和2491 hm-DBFSi-d),而对TPS单元进行额外氘代则进一步提高了器件的稳定性,从而验证了这一分子设计策略是同时实现超高色纯度、高效率和长工作寿命的有效途径。

相关成果以标题《Tetraphenylsilane-Engineered MR-TADF  Emitters for Pure-Green OLEDs with High-Efficiency, Long Lifetime, and  Gamut Close to BT.2020 Standard》发表于Advanced Materials。深圳大学博士生薛追星为论文第一作者,深圳大学杨楚罗教授/胡宇轩助理教授为共同通讯作者。该工作得到国家自然科学基金委、深圳市科技计划、深圳大学科研团队培育计划、深圳大学青年学者科学基金的大力支持。

Tetraphenylsilane-Engineered MR-TADF  Emitters for Pure-Green OLEDs with High-Efficiency, Long Lifetime, and  Gamut Close to BT.2020 Standard
Zhuixing Xue, Yuxuan Hu, Zhiyi Chen, Xiudan Zhang, Jingsheng Miao, Chuluo Yang
https://doi.org/10.1002/adma.72684

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  1. CONNECT:[ UseTime:0.000505s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000902s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000283s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000547s ]
  8. SELECT * FROM `article` WHERE `id` = 510127 LIMIT 1 [ RunTime:0.012180s ]
  9. UPDATE `article` SET `lasttime` = 1778952299 WHERE `id` = 510127 [ RunTime:0.003314s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 510127 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000447s ]
  12. SELECT * FROM `article` WHERE `id` > 510127 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001427s ]
  13. SELECT * FROM `article` WHERE `id` < 510127 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000821s ]
  14. SELECT * FROM `article` WHERE `id` < 510127 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006127s ]
  15. SELECT * FROM `article` WHERE `id` < 510127 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002101s ]
0.120761s