Highly Emissive Green ZnSeTe Quantum Dots: Effects of Core Size on Their Optical Properties and Comparison with InP Counterparts
Suk‐Young Yoon, Jee‐Na Han, Young-Ju Lee, Ali Imran Channa, Dae‐Yeon Jo, Hyun‐Min Kim, Yuri Kim, Seong Min Park, Seoyeon Park, Yang‐Hee Kim, Heesun Yang
Abstract
InP quantum dots (QDs) are the representative environmentally benign green and red emitters in color-by-blue display devices. However, particularly green InP QDs possess inferior blue absorption capability due to their intrinsically small core size. In this work, different-sized green-emissive ZnSeTe cores are synthesized while maintaining the same Se/Te ratio. Size-dependent molar absorption coefficients (ε 450 nm ) at 450 nm of a series of ZnSeTe cores are assessed, nearly scaling with the core volume, and further compared with that of a green InP counterpart. Subsequently, ZnSe/ZnSeS/ZnS triple shelling is implemented on different-sized ZnSeTe cores, yielding 509–530 nm in photoluminescence (PL) wavelength, 80–92% in PL quantum yield, and a similar volume scaling of ε 450 nm . For a practical verification of color-by-blue performances, InP and ZnSeTe core/shell QDs in the form of a QD plate are combined with a blue LED, revealing that the latter QDs afford more efficient blue light absorption and color conversion than the former ones.