Phosphor-converted white-emission LEDs using intrinsic yellow emissive ZnO and blue emissive ZnO/GO QDs

Won Kook Choi; Hong Hee Kim

doi:10.1117/12.3001410

16 March 2024 Phosphor-converted white-emission LEDs using intrinsic yellow emissive ZnO and blue emissive ZnO/GO QDs

Won Kook Choi, Hong Hee Kim

Proceedings Volume PC12887, Oxide-based Materials and Devices XV; PC128870L (2024) https://doi.org/10.1117/12.3001410
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Super-Eg excitation wavelength dependent Zni-VO complex defects related characteristic emissions of green, yellow, and orange-red from ZnO QDs are completely inhibited by reducing oxygen vacancies through the hybridization of Zn interstitials in ZnO QDs with antibonding O- states of graphene oxide (GO) QDs. Only λex independent violet-purple-blue (V-P-B) emission resulting from transitions among Frenkel pairs (Zni0-VZn) and the defects Zni0-Oi in ZnO- GO QDs is successfully achieved. White-light emission from PL QD-LEDs is achieved using a mixture of yellow emissive ZnO and blue emissive ZnO-GO QDs with CIE (0.32, 0.34) excited by a UV LEDs chip (λ = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (λ = 438 nm) with luminance of 1980 cd/m2, a luminous eﬃcacy (LE) of 2.53 cd/A, and external quantum eﬃciency (EQE) of 2.78% with CIE (0.16, 0.11) are also realized.

Conference Presentation

Citation Download Citation

Won Kook Choi and Hong Hee Kim "Phosphor-converted white-emission LEDs using intrinsic yellow emissive ZnO and blue emissive ZnO/GO QDs", Proc. SPIE PC12887, Oxide-based Materials and Devices XV, PC128870L (16 March 2024); https://doi.org/10.1117/12.3001410

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