光子上转换
激发态
材料科学
光催化
吸收(声学)
发色团
镧系元素
光化学
光电子学
半导体
石墨氮化碳
波长
离子
兴奋剂
原子物理学
化学
催化作用
物理
复合材料
有机化学
生物化学
作者
Xiaodong Zhao,Qian Liu,Xiaolei Li,Hui Li,Zhurui Shen,Huiming Ji,Tianyi Ma
标识
DOI:10.1002/anie.202219214
摘要
The nitrogen-deficient graphitic carbon nitride (g-C3 N4 ) has been prepared, a new excited state absorption (ESA) up-conversion mode is discovered, which is directly induced by structural defects, showing distinct chemical characteristics from those based on lanthanide ions and triplet states chromophores. The abundant N2C vacancies in g-C3 N4 nanosheets work as the crucial intermediate excitation states, which lead to g-C3 N4 upconverted emitting at the wavelength of 436 nm excited by the light with the wavelength of 800 nm. This process is proven to proceed via a two-photon involved ESA mode with a breakthrough quantum efficiency of 0.64 %. Further, we combine N2C vacancies enriched g-C3 N4 with In2 S3 and CdS, and successfully achieved an infrared light driven photocatalytic reactions. These findings offered a new family of up-conversion materials; more semiconductors with various structural defects are potential complementary members.
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