A rapid in situ synthesis of wide-spectrum CD@BaCl2 phosphors via anti-solvent recrystallization for white LEDs,Inorganic Chemistry Frontiers

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A rapid in situ synthesis of wide-spectrum CD@BaCl2 phosphors via anti-solvent recrystallization for white LEDs
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-21 , DOI: 10.1039/d0qi01054e
Jinhui Liang _{1,

2,

3,

4} , Baozhen Yang _{1,

2,

3,

4} , Chu-Yao Zhong _{1,

2,

3,

4} , Jilin Zhang _{4,

5,

6,

7} , Jin He _{1,

2,

3,

4} , Yibo Chen _{1,

2,

3,

4,

8} , Zhao-Qing Liu _{1,

2,

3,

4}

Affiliation

The development of solid-state carbon dots with good photoluminescence performance both at room temperature and high temperature is still challenging. Herein, we apply a facile and rapid anti-solvent-induced in situ recrystallization where the carbon dots act as the seeds of heterogeneous nucleation to encapsulate them into barium chloride crystals. Benefiting from the spatial confinement effect of barium chloride, the carbon dots are well separated in the recrystallized barium chloride crystals, thereby inhibiting the non-radiative electron–electron energy interactions between the aggregated carbon dots, presenting a wide-spectrum (FWHM = 107 nm) solid-state green-emission. Impressively, the carbon dot@barium chloride shows excellent photoluminescence thermal stability that at 423 K the intensity can maintain ∼90% of the initial intensity at room temperature, due to the low electron–electron/electron–phonon non-radiative energy transfer between the carbon dots and barium chloride. Further, the practicability of solid-state carbon dot@barium chloride phosphors was demonstrated by a series of fabricated white light-emitting-diode prototypes, in which the increment in the wide-spectrum green phosphors improved the color rendering index of the prototypes from 78.6 to 89.1. The facile synthesis process and favorable photoluminescence features will shed light on the further development of environment-friendly carbon-dot-based composites for various solid-state optoelectronic devices.

中文翻译：

通过反溶剂重结晶对白光LED快速原位合成宽光谱CD @ BaCl2荧光粉

在室温和高温下都具有良好的光致发光性能的固态碳点的开发仍然具有挑战性。在本文中，我们应用了一种简便而快速的反溶剂诱导原位再结晶，其中碳点充当异质形核的种子，将它们封装成氯化钡晶体。得益于氯化钡的空间限制效应，碳点在重结晶的氯化钡晶体中得到了很好的分离，从而抑制了聚集碳点之间的非辐射电子-电子能量相互作用，从而产生了宽光谱（FWHM = 107 nm ）固态绿色发射。令人印象深刻的是，碳点@氯化钡具有出色的光致发光热稳定性，在423 K下，该强度在室温下可保持约90％的初始强度，这是因为碳之间的低电子-电子/电子-声子之间的非辐射能转移碳点和氯化钡。进一步，一系列制造的白色发光二极管原型证明了固态碳点@氯化钡磷光体的实用性，其中广谱绿色磷光体的增加将原型的显色指数从78.6提高到89.1 。简便的合成工艺和良好的光致发光特性将为进一步开发适用于各种固态光电器件的环保碳点基复合材料提供启发。

更新日期：2020-11-04

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