Yoon Soyeon Seo min jun Kim, In Soo Lee, Kwangyeol Woo, Kyoungja 2024-01-12T02:32:20Z 2024-01-12T02:32:20Z 2023-02-17 2023-02 1613-6810 https://pubs.kist.re.kr/handle/201004/75807 Poor stability of CsPbBr3 perovskite nanocrystals (NCs) to moisture/heat/light has significantly limited their application as a green phosphor, despite their outstanding luminescent properties. Here, a remarkably stable CsPbBr3 NCs-silica composite phosphor functionalized with surface phenyl molecules (CsPbBr3-SiO2Ph) is synthesized by controlling low-temperature hydrolysis and condensation reaction of perhydropolysilazane in the presence of CsPbBr3 NCs followed by phenyl-functionalization. Through the process, CsPbBr3 NCs are confined in a compact silica matrix, which is impermeable to H2O. The synthesis strategy is extended to a classical red quantum dot, CdZnSeS@ZnS NCs, to fabricate a white light emitting diode (WLED) consisting of CsPbBr3-SiO2Ph and CdZnSeS@ZnS-SiO2Ph phosphor and silicone resin packaged on a commercial blue InGaN chip with luminous efficacy (LE) of 9.36 lm W-1. The WLED undergoes enhancements in both green and red photoluminescence over time to achieve a highly efficient performance of 38.80 lm W-1. More importantly, the WLED exhibits unprecedented operational stability of LE/LE0 = 94% after 101 h-operation at 20 mA (2.56 V). The ultra-high operational stability and efficient performance are mainly attributed to thermal curing and aging through which grain growth occurs as well as deactivation of defect states by permeated atmospheric O-2. English Wiley - V C H Verlag GmbbH & Co. Ultra-Stable and Highly Efficient White Light Emitting Diodes through CsPbBr3 Perovskite Nanocrystals-Silica Composite Phosphor Functionalized with Surface Phenyl Molecules Article 10.1002/smll.202206311 1 Small, v.19, no.7 Small 19 7 Y scie scopus 000933448000029 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ROOM-TEMPERATURE CSPBX3 PHOTOLUMINESCENCE LUMINESCENT FILMS NANOPARTICLES ENHANCEMENT PASSIVATION COATINGS BR aging compact silica enhanced photoluminescence operational stability thermal curing