Ultra-Long-Lived Red TADF-CDs: Solid-State Synthesis, Time-Dependent Phosphorescence Color And Luminescent Mechanism,Advanced Optical Materials

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Ultra-Long-Lived Red TADF-CDs: Solid-State Synthesis, Time-Dependent Phosphorescence Color And Luminescent Mechanism
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2024-01-02 , DOI: 10.1002/adom.202302542
Jie Sun ₁ , Zhongqiao Sun ₁ , Ziru Wang _{1,

2} , Nan Wang ₃ , Yide Han ₁ , Lin Zhang ₄ , Bingsen Zhang _{2,

5} , Xia Zhang ₁

Affiliation

Constructing an ultra-long-lived red thermally activated delayed fluorescence carbon dots (TADF-CDs) with time-dependent phosphorescence colors (TDPC) in both solid and aqueous is still a challenge. Herein, a red TADF-CDs, constructed via. a modified solid-state pyrolysis strategy, show the phosphorescence emissions at 595, 670, and 725 nm with the afterglow lifetime longer than most of reported red TADF-materials. In addition, the resulting CDs trigger the TDPC activity while the emission colors changed from red to green both in solid state and in aqueous suspension. The synergistic effects of boron-hybridization in the seed CDs and the additional C═O groups generated in urea-assisted pyrolysis, result in a stronger spin-orbit coupling (SOC) between the ¹(n, π^*) and the ³(π, π^*), the mitigated energy gap (ΔE_ST) and the non-radiative relaxations of triplet excited states. The TDPC performance endow the resulting TADF-CDs the usability in advance information security with enhanced-security-level encryption strategy.

中文翻译：

超长寿命红色TADF-CD：固态合成、时间依赖性磷光颜色和发光机制

在固体和水相中构建具有时间依赖性磷光颜色 (TDPC) 的超长寿命红色热激活延迟荧光碳点 (TADF-CD) 仍然是一个挑战。在此，构建了红色 TADF-CD。一种改进的固态热解策略，显示出 595、670 和 725 nm 的磷光发射，余辉寿命比大多数报道的红色 TADF 材料更长。此外，所得的 CD 触发了 TDPC 活性，同时在固态和水悬浮液中发射颜色从红色变为绿色。种子 CD 中硼杂化和尿素辅助热解中产生的额外 C=O 基团的协同效应，导致¹ ( n , π ^* ) 和³ ( π ) 之间产生更强的自旋轨道耦合 (SOC) , π ^* )、减小的能隙 (Δ E _ST ) 和三重激发态的非辐射弛豫。 TDPC 性能赋予最终的 TADF-CD 具有增强安全级别加密策略的高级信息安全可用性。

更新日期：2024-01-02

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