Abstract The combination of red quantum dots with YAG phosphors was used to improve color rendering of LEDs and color gamut of LED backlight. To further improve the stability of quantum dots applications, we encapsulate quantum dots with silicon dioxide. Quantum dots have a certain stability enhancement after coating silica. And the quantum dots-based LEDs fabricated using the modified quantum dots have luminous efficiency of up to 114 lm/w under 30 mA. At the same time, we investigated the temperature tolerance, UV stability and thermal characteristics of quantum dots devices. At the high temperature of 150 ℃, the photoluminescence intensity of the silicon-coated quantum dots increases rather than decreases. In contrast, untreated quantum dots are almost ineffective. Under different operating currents and ambient temperatures, the correlation color temperature, luminous flux, color rendering index and coordinates stability of the silica encapsulated quantum dots device is better than the untreated one. After one month of accelerated aging test, the quantum dots devices have nearly stable optical parameters, such as luminous flux and color rendering index, and high reliability. A set of characteristics indicate that silica-coated quantum dots devices are well suited for large-scale industrial production and commercial applications.

中文翻译：

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硅涂层 CdZnSeS/ZnS 量子点有助于实现高性能的白光发光二极管

摘要 红色量子点与YAG荧光粉的结合用于改善LED的显色性和LED背光的色域。为了进一步提高量子点应用的稳定性，我们用二氧化硅封装了量子点。量子点在包覆二氧化硅后有一定的稳定性增强。并且使用改性量子点制造的基于量子点的 LED 在 30 mA 下具有高达 114 lm/w 的发光效率。同时，我们研究了量子点器件的温度耐受性、紫外线稳定性和热特性。在150 ℃高温下，硅包覆量子点的光致发光强度不减反增。相比之下，未经处理的量子点几乎无效。在不同的工作电流和环境温度下，二氧化硅封装的量子点器件的相关色温、光通量、显色指数和坐标稳定性均优于未处理的器件。经过1个月的加速老化测试，量子点器件光通量、显色指数等光学参数基本稳定，可靠性高。一组特性表明，二氧化硅涂层的量子点器件非常适合大规模工业生产和商业应用。