Abstract
Inorganic perovskites have emerged as a promising candidate for light-emitting devices due to their high stability and tunable band gap. However, the power consumption and brightness have always been an issue for perovskite light-emitting diodes (PeLEDs). Here, we improved the luminescence intensity and decreased the current density of the PeLEDs based on CsPbI3 quantum dots (QDs) and p-type Si substrate through an alternating current (AC) driving mode. For the different driving voltage modes (under a sine pulsed bias or square pulsed bias), a frequency-dependent electroluminescent (EL) behavior was observed. The devices under a square pulsed bias present a stronger EL intensity under the same voltage due to less thermal degradation at the interface. The red PeLEDs under a square pulsed bias driving demonstrate that the EL intensity drop-off phenomenon was further improved, and the integrated EL intensity shows the almost linear increase with the increasing driving voltage above 8.5 V. Additionally, compared to the direct current (DC) driving mode, the red PeLEDs under the AC condition exhibit higher operating stability, which is mainly due to the reducing accumulated charges in the devices. Our work provides an effective approach for obtaining strong brightness, low power consumption, and high stability light-emitting devices, which will exert a profound influence on coupling LEDs with household power supplies directly.
Highlights
Perovskite materials are emerging as semiconductors with potential applications in optoelectronic devices [1,2,3,4,5,6,7,8]. Their characteristics of high color purity [9,10,11,12], tunable band gap [13,14,15,16,17], and low cost [18,19] are favorable for obtaining light-emitting diodes (LEDs)
In previous works [23,24,25,26], the perovskite light-emitting diodes (PeLEDs) were usually studied under a direct current (DC) driving condition and they have one thing in common: the electroluminescent (EL) intensity drops off obviously at a high driving voltage due to heat generation and charge accumulation in the defect states, which would increase the power consumption of the devices
Our findings provide an effective approach for obtaining a strong brightness, low power consumption, and high stability light-emitting device, which will exert profound influence on directly coupled LEDs with household power supplies
Summary
Perovskite materials are emerging as semiconductors with potential applications in optoelectronic devices [1,2,3,4,5,6,7,8] Their characteristics of high color purity [9,10,11,12], tunable band gap [13,14,15,16,17], and low cost [18,19] are favorable for obtaining light-emitting diodes (LEDs). In previous works [23,24,25,26], the PeLEDs were usually studied under a direct current (DC) driving condition and they have one thing in common: the electroluminescent (EL) intensity drops off obviously at a high driving voltage due to heat generation and charge accumulation in the defect states, which would increase the power consumption of the devices. Our findings provide an effective approach for obtaining a strong brightness, low power consumption, and high stability light-emitting device, which will exert profound influence on directly coupled LEDs with household power supplies
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