Optical Capacitance/Conductance-Voltage Characteristics of Stored Charges in Organic Light-Emitting Diodes

Zhang, Chengwen; Xu, Zheng; Wang, Peng; Qin, Zilun; Wageh, S.; Al-Ghamdi, Ahmed A.; Zhao, Suling

doi:10.3390/molecules25122818

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…2b, it can be seen that the movement of the HTL/Gp interface will affect the capacitance, further indicating that the accumulation of interface charges will affect the capacitance of the device. [4] Therefore, in this paper, we mainly study the tuning of capacitance by the holes.…”

Section: Resultsmentioning

confidence: 99%

P‐15.8: Fine Tuning the Green Device Capacitance by Adjusting the Energy Gap of the Functional Layer

Zhou,

Gao,

et al. 2024

Symp Digest of Tech Papers

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As the applied range and consumer demand increase, display quality performances of the products, such as smear phenomenon become more and more important. The correlation between smear and green device capacitance, so how to tune the green device capacitance to match that of the red and blue becomes key factor. In this paper, we achieve this by matching the energy gap of the functional layer, the goal of regulating green device capacitance is achieved, thereby improving the smear problem of mobile displays.

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Section: Resultsmentioning

confidence: 99%

P‐15.8: Fine Tuning the Green Device Capacitance by Adjusting the Energy Gap of the Functional Layer

Zhou,

Gao,

et al. 2024

Symp Digest of Tech Papers

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“…The film thickness was measured by an ellipsometer, which is exhibited in Table 1 . In this paper, the parameters of approximate thicknesses of 4 nm, 6 nm, 8 nm, and 10 nm were taken as reference and the device structures of ITO (100 nm)/PMMA (4 nm, 6 nm, 8 nm, 10 nm)/Alq 3 (80 nm)/LiF (0.6 nm)/Al (80 nm) were prepared to give storage as mentioned in reference [ 44 ]. The PMMA-free device is the control device.…”

Section: Resultsmentioning

confidence: 99%

A New Benchmark of Charges Storage in Single-Layer Organic Light-Emitting Diodes Based on Electrical and Optical Characteristics

Zhang

Wang

et al. 2021

Molecules

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The storage of charges in organic light-emitting diodes (OLEDs) has drawn much attention for its damage to device performance as well as the loss to carriers. Thus, it is essential to address the issue and do further investigation. The traditional approach to storage analysis is mainly based on transient measurement since it is sensitive to transient instead of steady signal. In this paper, we proposed a new benchmark to investigate the single-layer OLEDs capable of stored charges with poly (methyl methacrylate) (PMMA), which is just based on electrical and optical characteristics. Since the stored charges contribute both to luminance and current of the devices with PMMA, the area between them can be taken as a benchmark and evaluated the storage of charges. In our experiment, the areas of 4 nm, 6 nm, 8 nm, and 10 nm PMMA devices are 0.348, 0.554, 0.808, and 0.894, respectively, indicating a higher capability of storage in thicker PMMA. It is exactly in line with the results taken from transient electroluminescence (EL) measurement. Thus, this new benchmark is practical and provides a more accessible approach to investigate the storage of charges in OLEDs.

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“…Additionally, a slight increase in capacitance within the range of 3 to 6 V can be seen in Figure 5c. We consider this to be caused by the hole being trapped in the HTL/EML interface owing to the imbalanced injection of the hole and electron [31,32].…”

Section: Analysis Of the Degradation Of Blue Tadf Oleds By Different ...mentioning

confidence: 99%

Operational Stability Analysis of Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Using the Capacitance-Voltage Method

Park

2022

Applied Sciences

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We analyzed the degradation features by measuring the capacitance–voltage characteristics after electrically aging blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs). The measurement was investigated in terms of the hole transfer layer (HTL) and electron transfer layer (ETL) structures. For the HTL, three different materials—N,N′–bis(naphthalen–1–yl)–N,N′–bis(phenyl)–benzidine (NPB), 4,4′,4″-tris(carbazol–9–yl)triphenylamine (TCTA), and 1,3–bis(carbazol–9–yl)benzene (mCP)—were used at the HTL/emission layer (EML) interface; the TCTA/EML interface had the highest stability among the interfaces. For the ETL, bis [2–(diphenylphosphino)phenyl] ether oxide (DPEPO) without further dopants was used as an exciton blocking layer (ExBL) to effectively confine the excitons at the EML. However, DPEPO has low stability and carrier mobility. Therefore, 0, 10, and 40 nm-thick ExBL devices were investigated; it was found that the 0 nm-thick ExBL device was the most stable. However, the 10 nm-thick ExBL is essential to confine the excitons at the EML, which ensures a high EL performance.

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Optical Capacitance/Conductance-Voltage Characteristics of Stored Charges in Organic Light-Emitting Diodes

Cited by 3 publications

References 51 publications

P‐15.8: Fine Tuning the Green Device Capacitance by Adjusting the Energy Gap of the Functional Layer

P‐15.8: Fine Tuning the Green Device Capacitance by Adjusting the Energy Gap of the Functional Layer

A New Benchmark of Charges Storage in Single-Layer Organic Light-Emitting Diodes Based on Electrical and Optical Characteristics

Operational Stability Analysis of Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Using the Capacitance-Voltage Method

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