Fluorescent carbon dots (CDs) have drawn significant attention due to their variable species and intriguing optical properties; however, spectrally tuning the fluorescence color of CDs, especially in a long-wavelength region, is still a challenge. In this study, CDs were synthesized through the hydrothermal reaction of 2,5-diaminobenzenesulfonate (DBS) and dodecyl sulfate (DS) in the confined interlayer space of layered double hydroxides (LDHs). Particularly, the emission color of the obtained CD/LDH phosphors could be spectrally tuned from greenish-yellow (λ_em = 537 nm) to red (λ_em = 597 nm) by simply changing the molar ratio of the intercalated DBS and DS. Through the detailed characterization of different interlayer CDs by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy (XPS), a new route of modulating the absorption and emission wavelengths of CDs by regulating the content of graphitic nitrogen during heteroatom doping is presented. In addition, the stabilities of the solid-state luminescence against UV bleaching and temperature variation were improved by the rigid 2-dimensional (2D) LDH matrix, and prospective applications of the proposed CD/LDH phosphors were demonstrated in multicolour displays and in the fabrication of white light-emitting diodes (WLEDs).

中文翻译：

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二维分层双氢氧化物基质中具有可调长波长发射的碳点的受限合成

荧光碳点（CD）由于其种类多样且具有吸引人的光学特性而备受关注。然而，特别是在长波长区域中，光谱地调节CD的荧光颜色仍然是一个挑战。在这项研究中，CDs是在层状双氢氧化物（LDHs）的受限夹层空间中通过2,5-二氨基苯磺酸盐（DBS）和十二烷基硫酸盐（DS）的水热反应合成的。特别地，所得到的CD / LDH荧光体的发光颜色，可以从光谱绿黄色（调谐λ _EM = 537 nm）至红色（λ _EM通过简单地改变插入的DBS和DS的摩尔比，即可获得597 nm）（= 597 nm）。通过傅里叶变换红外光谱（FTIR），拉曼光谱，元素分析和X射线光电子能谱（XPS）对不同夹层CD进行详细表征，通过调节CD的含量调节CD吸收和发射波长的新途径。介绍了杂原子掺杂过程中的石墨氮。此外，刚性二维（2D）LDH基质提高了固态发光对UV漂白和温度变化的稳定性，并且在多色显示器和制造中证明了建议的CD / LDH磷光体的预期应用。白色发光二极管（WLED）的数量。