scholarly journals Mobile ions determine the luminescence yield of perovskite light-emitting diodes under pulsed operation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Naresh Kumar Kumawat ◽  
Wolfgang Tress ◽  
Feng Gao
Keyword(s):  
Light Emitting Diodes ◽  
Operation Mode ◽  
Visible Light Communication ◽  
Transient Effects ◽  
Low Frequencies ◽  
Light Emitting ◽  
Long Term Stability ◽  
Electroluminescence Intensity ◽  
Mobile Ions

AbstractThe external quantum efficiency of perovskite light-emitting diodes (PeLEDs) has advanced quickly during the past few years. However, under pulsed operation, an operation mode which is important for display and visible light communication, the performance of PeLEDs changes a lot and requires in-depth understanding to facilitate these applications. Here, we report the response of PeLEDs under pulsed operation in the range of 10 Hz to 20 kHz. Beyond transient effects in the low frequencies, we find that for higher frequencies (>500 Hz) the transient electroluminescence intensity depends strongly on the duty cycle. This feature is much more pronounced and of different origin than that in conventional LEDs. We rationalise our experimental observations using a mathematical model and assign these features to the effect of mobile ionic charges in the perovskite. Our work also provides important implications for the operation of PeLEDs under the steady state, where accumulation of mobile ions at the interfaces could be beneficial for high electroluminescence yields but harmful for the long-term stability.

Effect of perovskite film morphology on device performance of perovskite light-emitting diodes

Nanoscale ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 1505-1514 ◽  
Author(s):  
Jae Choul Yu ◽  
Jong Hyun Park ◽  
Sang Yun Lee ◽  
Myoung Hoon Song
Keyword(s):  
Light Emitting Diodes ◽  
Device Performance ◽  
Film Morphology ◽  
Interface Engineering ◽  
Morphological Control ◽  
Light Emitting ◽  
Term Stability ◽  
Long Term Stability

The device performance and long-term stability of perovskite light-emitting diodes (PeLEDs) can be improved by morphological control of perovskite films such as film modification, interface engineering, and quasi 2D.

Surface Cleaning Challenges for Organic Light Emitting Diodes

2021 ◽  
Vol 314 ◽  
pp. 3-8
Author(s):  
Noel Giebink
Keyword(s):  
Light Emitting Diodes ◽  
Surface Cleaning ◽  
Organic Light Emitting Diodes ◽  
Large Area ◽  
Light Emitting ◽  
Organic Light ◽  
Organic Optoelectronic Devices ◽  
Soft Thin Film ◽  
Organic Optoelectronic

Organic optoelectronic devices such as light-emitting diodes and solar cells present unique challenges for surface cleaning and preparation because of their large area and the ‘soft’, thin film nature of the materials involved. This paper gives an introduction to this class of semiconductor devices and covers a recent example of how surface cleaning impacts the long-term reliability of organic light-emitting diodes being commercialized for solid-state lighting.

Investigation on infrared electroluminescence from Er3+-doped Tb2O3 light-emitting diodes

2021 ◽  
pp. 2050005
Author(s):  
Hao Li ◽  
Shenwei Wang ◽  
Liyuan Bai ◽  
Kai Ou ◽  
Yanwei Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Energy Transfer ◽  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Doping Concentration ◽  
Light Emitting Diodes ◽  
Radio Frequency Magnetron Sputtering ◽  
Light Emitting ◽  
Structure And Morphology ◽  
Electroluminescence Intensity

Tb2O3:Er light-emitting diodes were prepared by radio-frequency magnetron sputtering method and the EL performance of the devices were studied. The crystal structure and morphology of the annealed films were investigated by XRD and SEM, respectively. The EL spectrum was achieved and the EL principle was discussed. Six emission peaks of Er[Formula: see text] located at 402, 517, 548, 649, 691, and 1,538[Formula: see text]nm were observed, achieving energy transfer from Tb[Formula: see text] to Er[Formula: see text]. In order to study the effect of Er+ doping concentration, the doping concentrations of Tb2O3:Er films were from 5[Formula: see text]at.% to 20[Formula: see text]at.%. The effect on electroluminescence intensity of doping concentration was investigated and the optimal doped concentration was 15[Formula: see text]at. %.

The Effect of Manganese Doping on Mobile Ions in Perovskite Light-emitting Diodes

2019 ◽  
Author(s):  
Moritz Futscher ◽  
Mahesh Gangishetty ◽  
Daniel Congreve ◽  
Bruno Ehrler
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Manganese Doping ◽  
Mobile Ions

Cascade GaN-based blue micro-light-emitting diodes for dual function of illumination and visible light communication

2020 ◽  
Vol 53 (35) ◽  
pp. 355103 ◽  
Author(s):  
Huamao Huang ◽  
Haocheng Wu ◽  
Cheng Huang ◽  
Tianxiang Lan ◽  
Qingyuan Han ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Emitting Diodes ◽  
Visible Light Communication ◽  
Dual Function ◽  
Light Emitting

High performance solution-processed green phosphorescent organic light-emitting diodes with high current efficiency and long-term stability

2019 ◽  
Vol 7 (37) ◽  
pp. 11569-11580 ◽  
Author(s):  
Athithan Maheshwaran ◽  
Vijaya Gopalan Sree ◽  
Ho-Yeol Park ◽  
Woosum Cho ◽  
Hyein Kim ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Performance ◽  
Organic Light Emitting Diodes ◽  
High Current ◽  
Solution Processed ◽  
High Current Efficiency ◽  
Light Emitting ◽  
Long Term Stability ◽  
Organic Light

Highly efficient (D–π–A)-type host and green Ir(iii) complexes are introduced for solution-processed PHOLEDs that achieve high CE with considerably high EQE. The devices with symmetrical complex show more stable than those with asymmetrical complex.

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