物理化学学报 >> 2026, Vol. 42 >> Issue (11): 100253.doi: 10.1016/j.actphy.2026.100253

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通过调整电荷注入方向实现的绿色/红色双模式倍增型有机光电探测器

张帅1, 屈宏飞1, 张路1, 赵兴超1, 张路鑫2, 马尧2, 沈亮2, 马晓玲1, 张福俊1   

  1. 1 北京交通大学物理科学与工程学院, 先进有机材料与器件物理实验室, 北京 100044;
    2 吉林大学电子科学与工程学院, 集成光电子学国家重点实验室, 吉林 长春 130012
  • 收稿日期:2025-12-18 修回日期:2026-01-30 录用日期:2026-02-01 发布日期:2026-09-29
  • 通讯作者: 沈亮, 马晓玲, 张福俊 E-mail:shenliang@jlu.edu.cn;xlma2@bjtu.edu.cn;fjzhang@bjtu.edu.cn
  • 基金资助:
    本工作由中央高校基本科研业务费(2025YJS187)；国家自然科学基金(U22A6002, 62475094, 12474420, 12404471)资助

Green/red dual-mode photomultiplication model organic photodetectors via adjusting charge injection direction

Shuai Zhang1, Hongfei Qu1, Lu Zhang1, Xingchao Zhao1, Luxin Zhang2, Yao Ma2, Liang Shen2, Xiaoling Ma1, Fujun Zhang1   

  1. 1 Advanced Organic Materials and Devices Laboratory, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, Jilin Province, China
  • Received:2025-12-18 Revised:2026-01-30 Accepted:2026-02-01 Published:2026-09-29
  • Contact: Liang Shen, Xiaoling Ma, Fujun Zhang E-mail:shenliang@jlu.edu.cn;xlma2@bjtu.edu.cn;fjzhang@bjtu.edu.cn

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摘要： 我们制备了一系列poly (9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT):poly [4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno [3,4-b] thiophene-)-2-carboxylate-2-6-diyl] (PTB7-Th) (3 : 1, w/w)/Glass/indium tin oxide (ITO)/poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-5,5'-bis(2,2'-thiophene)-2,6-naphthalene-1,4,5,8-tetracaboxylic-N,N'-di(2-ethylhexyl)imide] (PNDIT-F3N)/poly(3-hexylthiophene) (P3HT):[6,6]-phenylC71-butyric acid methyl ester (PC71BM) (100 : 1, w/w)/Aluminum (Al)结构的双模式倍增型有机光电探测器(PMOPDs)。外部F8BT:PTB7-Th层用作有机滤光层(OFL)来调节PMOPDs中的光场分布。在正反向偏压下的PMOPDs可以实现双窄带特性，这是由ITO和Al电极附近的受陷电子分布分别决定的。在8 V偏压下，PMOPDs表现出绿色窄带响应，半峰全宽(FWHM)为85 nm，545 nm处的峰值外量子效率(EQE)为8880%。同时，在-8 V偏压下，PMOPDs表现出红色窄带响应，FWHM为60 nm，峰值EQE为750%。正向偏压下ITO电极附近的受陷电子分布和反向偏压下Al电极附近的受陷电子分布可以很好地解释PMOPDs的可切换窄带响应特性。我们利用最优的双模式PMOPDs构建了光电容积脉搏波(PPG)测量系统，成功监测了人体在不同状态下的心率。从原始的PPG信号中获得了速率容积脉搏波与加速度容积脉搏波信号，可以用来估计人体动脉的硬化程度，为血管疾病的诊断提供依据。

关键词: 光电倍增, 双模式, 窄响应, 心率监测

Abstract: Dual-mode photomultiplication model organic photodetectors (PMOPDs) were fabricated with an architecture of poly (9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT):poly [4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno [3,4-b] thiophene-)-2-carboxylate-2-6-diyl] (PTB7-Th) (3 : 1, w/w)/Glass/indium tin oxide (ITO)/poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-5,5'-bis(2,2'-thiophene)-2,6-naphthalene-1,4,5,8-tetracaboxylic-N,N'-di(2-ethylhexyl)imide] (PNDIT-F3N)/poly(3-hexylthiophene) (P3HT):[6,6]-phenylC71-butyric acid methyl ester (PC71BM) (100 : 1, w/w)/Aluminum (Al). To modulate the optical field distribution, an external layer of F8BT:PTB7-Th acts as an organic filter layer (OFL) in PMOPDs. Dual-mode characteristics can be achieved from PMOPDs under forward and reverse bias, which is individually determined by the trapped electron distribution near ITO and Al electrode. The PMOPDs achieve a green narrowband response under 8 V bias, with peak external quantum efficiency (EQE) of 8880% at 545 nm and full width at half maximum (FWHM) of 85 nm. Conversely, a red narrowband response is registered under -8 V bias of PMOPDs, centered at 620 nm with peak EQE of 750% and FWHM of 60 nm. The operating mechanism for the switchable mode of PMOPDs involves the modulation of trapped electron distribution, which shifts between the vicinity of ITO electrode under forward bias and Al electrode under reverse bias. A photoplethysmography (PPG) measurement system based on the optimal dual-mode PMOPDs was developed to enable the successful monitoring of heart rate across different conditions. The velocity plethysmography and acceleration plethysmography can be obtained from original PPG signals to estimate arteriosclerosis for vascular disease diagnosis.

Key words: Photomultiplication, Dual-mode, Narrowband response, Heart rate monitoring