Abstract
We demonstrate excellent color quality of liquid-type white light-emitting diodes (WLEDs) using a combination of green light-emitting CsPbBr3 and red light-emitting CdSe/ZnS quantum dots (QDs). Previously, we reported red (CsPbBr1.2I1.8) and green (CsPbBr3) perovskite QDs (PQDs)-based WLEDs with high color gamut, which manifested fast anion exchange and stability issues. Herein, the replacement of red PQDs with CdSe/ZnS QDs has resolved the aforementioned problems effectively and improved both stability and efficiency. Further, the proposed liquid-type device possesses outstanding color gamut performance (132% of National Television System Committee and 99% of Rec. 2020). It also shows a high efficiency of 66 lm/W and an excellent long-term operation stability for over 1000 h.
Highlights
White light-emitting diodes (WLEDs), known as solid-state devices, have recently been intensively investigated
The major advantages of WLEDs are low-power consumption and long lifetime resulting in their great potential for lighting, signal, and display applications [1,2,3,4,5]
We used green (CsPbBr3) and red (CsPbBr1.2I1.8) perovskite QDs (PQDs) to fabricate WLED devices and the result showed that the excellent device performance can be achieved with a wide color gamut
Summary
White light-emitting diodes (WLEDs), known as solid-state devices, have recently been intensively investigated. Despite owing wide color gamut, we suffered with low luminous efficiency and poor stability of the proposed device [23] These problems led us to modify the device structure. Two types of WLED device structures are fabricated for comparison: hybrid-type (red CdSe/ZnS QDs solid film and green CsPbBr3 PQDs liquid) and liquid-type (mixing of green PQDs and red CdSe/ZnS QDs). Both prepared devices are excited using standard blue LEDs. The experiment results demonstrate that the liquid-type WLED achieves an outstanding color gamut performance with National Television System Committee (NTSC) higher than 132% and ITU-R Recommendation BT.2020 (Rec. 2020) of 99%. The luminous efficiency of the liquid-type WLED is 29% higher than that of the hybrid-type sample, and the attenuation is only 4% after 1000 h of operation
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