Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency,Advanced Optical Materials

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Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-02-06 , DOI: 10.1002/adom.201901938
Jian‐Yong Wei ₁ , Qing Lou ₁ , Jin‐Hao Zang ₁ , Zhi‐Yu Liu ₁ , Yang‐Li Ye ₁ , Cheng‐Long Shen ₁ , Wen‐Bo Zhao ₁ , Lin Dong ₁ , Chong‐Xin Shan ₁

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It still remains a challenge to synthesize solid‐state carbon dots (CDs) with high emission efficiency; a hurdle that has hindered the application of CDs in many fields. In this work, efficient fluorescent CDs have been prepared through a one‐step microwave‐assisted heating method. Experimental data show strong green emissions produced from the CD powders (CDPs), carrying an unprecedented 75.9% quantum yield due to both spatial confinement and defect reduction with the introduction of NaOH. Likewise, CDPs prepared in tens of grams at 3 min time intervals also achieve high production yields at ≈69.8%. Specifically, for white light‐emitting devices (WLEDs) with color coordinates of 0.366 and 0.366, when fabricated by coating CDPs with commercial red‐emitting phosphors on blue‐emitting LED chips, it is found that the luminous efficiency reached 52.3 lm W⁻¹. Besides, the WLEDs exhibit a high color rendering index of 93.5 and show great color chromatic stability even at a driving current of 200 mA.

中文翻译：

高效合成绿色荧光碳点粉

合成具有高发射效率的固态碳点（CD）仍然是一个挑战。阻碍CD在许多领域中应用的障碍。在这项工作中，通过一步微波辅助加热方法制备了有效的荧光CD。实验数据表明，CD粉末（CDP）产生了强烈的绿色排放，由于空间限制和引入NaOH减少缺陷而带来了空前的75.9％量子产率。同样，在3分钟的时间间隔内以数十克的量制备的CDP也可达到约69.8％的高产量。具体而言，对于色坐标为0.366和0.366的白色发光器件（WLED），当通过在蓝色发光LED芯片上用商用红色荧光粉涂覆CDP来制造时，发光效率达到52。^-1。此外，即使在200 mA的驱动电流下，WLED仍具有93.5的高显色指数，并具有出色的色彩稳定性。

更新日期：2020-04-06

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