講演情報
[15p-P12-31]ZnO nanoparticles-based green-LEDs using FAPbBr3 perovskite quantum dots
〇(M2)Shaaista Hasan1, Toshiyuki Yoshida1, Yasuhisa Fujita1,2 (1.Shimane Univ., 2.S-Nanotech Co-Creation Co., Ltd.)
キーワード：
light emitting diodes、perovskite quantum dots、zinc oxide
Over the past few decades, visible light emitting diodes have been the pinnacle of solid-state lighting technology owing to their energy and luminous efficiency, longevity, and versatility. Our group has previously demonstrated the world’s first white-LED (WLED) based on ZnO nanoparticles (NPs) using red, blue, and green phosphors. However, a major issue with commercially available visible-LEDs is their use of phosphor materials to down-convert the emission of blue- LEDs. These phosphor materials have broad emission spectra and low photoluminescence quantum yield (PLQY) which affects the quantum efficiency of the device. To overcome this issue, the fabrication and operation of green LEDs based on the down-conversion of ZnO nanoparticles (NPs) based UV-LEDs by using formamidinium lead bromide (FAPbBr3 (FAP)) perovskite quantum dots (QDs) has been investigated. The UV-LED has been fabricated via the solution-processing method with a spray-coated n-type barrier layer of Ga-doped ZnO on a GZO film at a temperature of 300 oC, while the p-type layer has been created by the spin coating method using N-doped p-type ZnO nanoparticles were used which were synthesized by the arc discharge method. Au electrodes of 30 nm thickness were deposited by gold evaporation method, and the electrodes were connected with the help of Ag paste and gold wire by the stamping method using a manual epoxy die bonder. The LED characteristics show drastically reduced leakage current due to the carrier confining layer (ZnO: Ga) which also contributes to a higher luminous output power. The electroluminescence (EL) spectra depicts the down conversion of incident UV emission (λ= 388 nm) of the LED into green-light emission (λ= 535 nm), wherein the comparable intensities conclude the efficiency of conversion with high quantum yield and minimal energy loss. The details of the result as well as the fabrication process will be presented.