Abstract We report a graphene embedded organic-inorganic hybrid (O-I hybrid) composites that can be utilized as robust encapsulants for white light emitting diodes (WLEDs). The effect of graphene and monomers on the thermal resistance, refractive index (RI), transparency, thermal conductivity, and thermal aging stability of the encapsulant were studied. This study has explicitly unveiled that the embedded graphene played a multifunctional role in producing a high-performance encapsulant. Compared with graphene free O-I hybrid encapsulant, RI, thermal conductivity and heat dissipation ability of the graphene embedded encapsulants were significantly improved. After continuous operation for 10 days, the color rendering index (Ra) of WLED with graphene embedded encapsulants changed from 89.5 to 89.2 (driving current 100 mA), while the correlated color temperature (CCT) altered from 4535 to 4546. Its luminous efficiency changed from 82.9 to 81.2 lm/W. The WLEDs with graphene embedded O-I hybrid encapsulant exhibited long-term stability. This work has paved the way for rational design and assembly of graphene embedded composites as robust materials for various requirements of WLED applications.

中文翻译：

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改进的有机-无机/石墨烯混合复合材料作为白光 LED 的密封剂：石墨烯、异丙醇钛 (IV) 和二苯基硅烷二醇的作用

摘要 我们报告了一种嵌入石墨烯的有机-无机杂化（OI 杂化）复合材料，可用作白光发光二极管 (WLED) 的坚固密封剂。研究了石墨烯和单体对封装材料的耐热性、折射率（RI）、透明度、导热性和热老化稳定性的影响。这项研究明确揭示了嵌入的石墨烯在生产高性能密封剂方面发挥着多功能作用。与不含石墨烯的 OI 混合封装材料相比，石墨烯嵌入封装材料的 RI、导热性和散热能力都有显着提高。连续运行10天后，石墨烯封装WLED的显色指数（Ra）从89.5变为89.2（驱动电流100 mA），而相关色温（CCT）从4535变为4546，发光效率从82.9变为81.2lm/W。嵌入石墨烯的 OI 混合密封剂的 WLED 表现出长期稳定性。这项工作为石墨烯嵌入复合材料的合理设计和组装铺平了道路，作为满足 WLED 应用各种要求的坚固材料。