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129th General Meeting of Korean Chemical Society & Exposition Cadmium Surface Passivation of Perovskite Nanocrystals for Blue LEDs

Submission Date :
2 / 28 / 2022 , 16 : 04 : 49
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Material Chemistry
Authors :
Woo Hyeon Jeong, Zhongkai Yu1, Hyosung Choi, Bo Ram Lee1,*
Department of Chemistry, Hanyang University, Korea
1Department of Physics, Pukyong National University, Korea
Assigned Code :
MAT.P-681 Assigend Code Guideline
Presenting Time :
April 14 (THU) 11:00~13:00
Next-generation electroluminescent displays require efficient and stable light-emitting diodes (LEDs) with low cost, excellent color purity for which perovskites-based LEDs (PeLEDs) are a promising candidate. Among the three primary colors, the low efficiencies and poor stability of blue color PeLEDs is the major hurdle to their commercialization. Here, we demonstrate an surface engineering strategy incorporating a simple hot injection method with one pot synthesis for surface passivation of cadmium ions (Cd2+) into blue-color all inorganic Cs base perovskite nanocrystals (PNCs). The optimized PNCs containing 0.2% Cd show improved photoluminescence quantum yield (PLQY; 66.8 %) and ambient stability, compared to the neat PNCs (25.5%) at an emission wavelength of 475 nm. PeLEDs with the PNC show a luminance of 51 cd/m2 and EQE of 3.71%.