Self‐quenching‐resistant and bright green‐emitting carbon dots (CDs) in the solid state were synthesized via a facile hydrothermal method. Their structure, optical properties together with their thermal and photostabilities, as well as their applicability in white LEDs were investigated. The obtained CDs have nearly spherical shape with a size around 4–5 nm. The resulting powder CDs show excitation‐independent emission behavior, and can be excited over a broad range from 300–450 nm. Under optimal excitation at 400 nm, the resultant powder CDs yield bright and broad green emission around 505 nm with full width at half maximum (FWHM) of about 110 nm and under 360 nm excitation with lifetime of 15.8 ns. A potential application of the green‐emitting CDs was evaluated by constructing a white light‐emitting diode lamp. The fabricated white LED lamp emitted bright, warm white light with excellent color rendering properties (a color rendering index of 86.9 and a correlated color temperature of 3863 K).

中文翻译：

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固态亮绿色碳点在白色发光二极管中的适用性评估

通过简便的水热法合成了固态的抗自熄性和亮绿色的碳点（CD）。研究了它们的结构，光学特性以及它们的热稳定性和光稳定性，以及它们在白光LED中的适用性。所获得的CD具有接近球形的形状，大小约为4–5 nm。生成的粉末CD表现出与激发无关的发射行为，并且可以在300-450 nm的宽范围内被激发。在400 nm的最佳激发下，所得的粉末CD在505 nm附近产生明亮而宽泛的绿色发射，半峰全宽（FWHM）约为110 nm，在360 nm激发下的寿命为15.8 ns。通过构造白色发光二极管灯，评估了绿色发光CD的潜在应用。