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碳点衍生分子光体的高固态光发光量子产量,用于发光器件

Nasir Javed^1,2, Haydee Pacheco¹, Sneha Sreekumar³

¹Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, 607 Taylor Road, Piscataway, NJ 08854, USA. ocarroll@rutgers.edu.

|May 13, 2024

概括

碳点 (CD) 中的有机光体聚合在固态中,改变它们的光发光 (PL). 这项研究描述了N4,N11-dimethyldibenzo[a,h]phenazine-4,11-diamine (BPD) 固态特性,优化了白色发光器件 (LED) 的PL量子产量 (PLQY).

科学领域:

材料科学材料科学材料科学
摄影化学的使用.
有机电子有机电子

背景情况:

通过自下而上的方法合成的碳点 (CD) 通常含有有机分子光体.
这些光体的特性依赖于度,并受到聚合的显著影响,特别是在固态中.
了解固态行为对于使用CD相关光体的应用至关重要.

研究的目的:

描述N4,N11-dimethyldibenzo[a,h]phenazine-4,11-diamine (BPD) 的固态光发光 (PL) 特性,这是一个形成CD的分子光体.
研究BPD度和聚合对其在固体矩阵中的PL量子产量 (PLQY) 的影响.
制造白色发光器件 (LED),使用BPD进行色彩转换.

主要方法:

使用光发光谱学对BPD的固态特征.
在不同度下将BPD纳入聚甲基甲酸 (PMMA) 和聚烯 (PS) 矩阵中.
在色彩转换层中制造具有BPD的蓝LED.

主要成果:

离散的BPD分子表现出激发波长独立的绿色PL (∼520nm).
聚合导致广泛的,蓝色移动的PL和PLQY显著下降.
优化的BPD度产生高的PLQY (75.9%在PMMA中, 40.2%在PS中),由于聚合诱导的非辐射衰变,在较高度下降到≤11%.
制造的LED可以实现白色发射 (CIE:0.35,0.37) 的发光效率为3.8 lm W-1和亮度为43.331 cd m-2.2.

结论:

固态BPD聚合极大地影响其光发光特性,需要控制度以获得最佳性能.
这项研究证明了BPD作为高效白色LED的固态发射器的潜力.
控制分子聚合是利用光电子设备中有机光体的全部潜力的关键.

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