Synthesis-on-substrate of quantum dot solids

Challenges and developments for the blue perovskite nanocrystal light-emitting diodes

“…113 Jiang et al directly synthesized ultra-small perovskite NCs film on a substrate. 114 Under a constant driving current, the electroluminescence wavelength and FWHM remained constant within 5 hours. When the initial brightness was 100 cd m −2 , the working half-life was 2 hours, which is about 5 times higher than that of the best efficient blue PeLED reported.…”

Effect of a-SiCxNy:H Encapsulation on the Stability and Photoluminescence Property of CsPbBr3 Quantum Dots

“…Recent studies have demonstrated that inorganic cesium lead halide perovskite (CsPbX 3 , Cl, Br, and I) quantum dots (QDs) have the potential to be used in optoelectronic applications, such as light-emitting diodes (LEDs) and high-definition displays, due to their high quantum yields (QYs), ultralow-voltage operation, and ultra-narrow room-temperature emission [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. However, for CsPbX 3 quantum dots, their crystal structure is inherently unstable, making them vulnerable to ion migration and decomposition in high-temperature, light, or humid conditions [ 10 , 11 , 12 , 13 , 14 , 15 ].…”

Tuning the energy transfer in Ruddlesden–Popper perovskites phases through isopropylammonium addition – towards efficient blue emitters

“…12–25 Recently, a record EQE of 17.9% has been reported by ligand manipulation in on-substrate synthesis of quantum dots. 26…”

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25] Recently, a record EQE of 17.9% has been reported by ligand manipulation in on-substrate synthesis of quantum dots. 26 At least three major approaches have been used to fabricate efficient blue-emissive MHP layers with high values of photoluminescence quantum yields (PLQYs), which acts as a primary indicator for a promising emissive layers in emitting devices technology. 27 These three approaches rely on the use of active layers of very different nature, namely: (i) 3D MHPs, 15,25,28 (ii) quasi-2D perovskites, 17,21,22,29,30 and (iii) nanocrystals based on 3D MHPs.…”