 The International Telecommunication Union ITU has announced a new color gamut standard, ITUR Recommendation BT.2020, which sets a challenging milestone for display technologies. Organic light emitting diodes, OLEDs, and important display technology in daily life face challenges in approaching the BT.2020 standard. Thermally activated delayed fluorescence, TADF, emitters have bright prospects in OLEDs due to their 100% theoretical exotone utilization. The development of TADF emitters emitting primary red, R, green, R, and blue, B, emission is significant. A comprehensive overview of the latest advancements in TADF emitters that exhibit Commission Internationale de la Clarage and CAE coordinate surpassing the National Television System Committee, NTSC, and approaching BT.2020 standards is presented. Rational strategies for molecular designs, resulting photo-physical properties, and OLED performances are discussed to elucidate the underlying mechanisms for shifting the CIE coordinates of both donor acceptor and multiple resonance, MR, typed TADF emitters toward the BT.2020 standard. The challenges in realizing the wide-color gamut BT.2020 standard and prospects for this research area are provided. This article was authored by Xiao Chen Fan, Xiao Yao Hao, Feng Huang, and others. We are article.tv, links in the description below.