厚膜电致发光技术（Thick-film dielectric electroluminescent，简称TDEL），一种电致发光技术，其结构类似常规的薄膜电致发光，在前电极与后电极之间包含包含1层或多层发光材料与介质材料，不同之处是薄膜电介质变更为厚膜，三基色荧光材料变更为蓝色电致发光材料及荧光转换材料的组合。该技术主要由加拿大iFire公司开发，但是因为其始终无法取得市场与关注，2007年，iFire公司开发停滞。

Thick-film dielectric electroluminescent (TDEL) technology is a phosphor-based flat panel display technology developed by Canadian company iFire Technology Corp. TDEL is based on inorganic electroluminescent (IEL) technology and has a novel structure that combines both thick- and thin-film processes. An IEL device generates light by applying an alternating electrical field to inorganic light-emitting phosphors. Traditional IEL displays are bright, very fast in video response time and highly tolerant of environmental extremes. However, the lack of full-color capability and large-size scalability has limited their application for the mainstream consumer television market. iFire has addressed these limitations by replacing the thin-film dielectric of traditional IEL technology with its patented thick-film, high-K dielectric material and structure. The result is a unique flat panel display technology that provides iFire displays with high performance and low cost potential. iFire was unable to develop displays competitive with LCD, plasma and OLED devices and wound up research and development in 2007.