Efficient and bright white light-emitting diodes based on single-layer heterophase halide perovskites

Halide Perovskite Light‐Emitting Diode Technologies

“…[167] Their devices achieved a maximum EQE of 0. based on a single perovskite layer of red-emitting α-CsPbI 3 and white-emitting self-trapped δ-CsPbI 3 , which showed an EQE of 6.5% and a peak luminance of 12 200 cd m −2 . [168] However, tuning the white color of their LEDs requires careful control of the annealing process. A more practical way for tunable color temperature involves a combination of blue PeLEDs and orangeemitting perovskite [169,170] or nonperovskite phosphors.…”

“…Inspired by the successful integration of 3D perovskites in highly efficient LEDs, other materials with similar structural features are gaining increasing attentions including double perovskites, [167,168,180,181] hollow 3D perovskites, [182][183][184][185] 2D-layered perovskites, [164][165][166] and 1D [163,186] and 0D perovskites. [187][188][189] The properties of these materials need to be assessed on an individual material basis, which makes the generalization of material characteristics across certain classes of perovskite difficult.…”

Organolead halide perovskites beyond solar cells: self-powered devices and the associated progress and challenges

“…While significant research efforts have been in pursuit of enhancing the PCE of perovskite solar cells (PSC), new applications of these materials are being researched with increasing efforts, for instance, lasers, light-emitting diodes (LEDs), photodetectors (PDs), gas sensors and tactile sensors. [28][29][30][31][32][33] In the past few years, OLHP based optoelectronic devices and sensors, capable of operating without an external power supply and exhibiting excellent performance, have been actively researched and reported, continuously advancing the field of self-powered devices. 34 Therefore, a review focusing on OLHP based self-powered devices will be useful for researchers in this field and also the broader research community.…”

Towards next generation white LEDs: optics-electronics synergistic effect in a single-layer heterophase halide perovskite

“…In another approach, Zeng's group at Nanjing University of Science and Technology (NJUST) in collaboration with D. Ginger at the University of Washington proposed a new concept of WLEDs relying on a single emissive layer of CsPbI 3 perovskite which combined α and δ-phases (Fig. 1a) 12 . EQE and current efficiency of these WLEDs which were conveniently fabricated by allsolution processing and featured only one broadband perovskite emitting layer reached 6.5% and 12,200 cd/m 2 , respectively.…”

“…The strategy used in ref. 12 relying on a single emitting perovskite layer to achieve white emission can greatly decrease the cost of production of WLEDs, and further push the development of next-generation flexible displays and lighting. This approach, as well as the one suggested in ref.…”