Tunable chromaticity stability in solution-processed organic light emitting devices

Huang, Meei-Feng; Lin, Wei‐Chieh; Fan, Chia-Chan; Wang, Yu-Shih; Lin, Hao‐Wu; Liao, Jia-Ling; Lin, Chih‐Hsun; Chi, Yun

doi:10.1016/j.orgel.2015.01.019

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…Recently, OLEDs based on thermally activated delayed fluorescence (TADF) have received wide attention due to both high efficiency and low cost. In 2015, Huang et al fabricated color-tunable OLEDs through the solution-processed method with TCAC as the host material, FIrpic as the blue dopant, Os(btfp)2(pp2b) as the red dopant, and Os(bptz)2(dppb) as the yellow dopant of light-emitting layers (EMLs) (Figure 5d) [72]. The EQE of multi-OLEDs is up to 13.6%, as shown in Figure 5e.…”

Section: Double Emission Layersmentioning

confidence: 99%

Multi-Color Light-Emitting Diodes

et al. 2023

Coatings

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Multi-color light-emitting diodes (LEDs) with various advantages of color tunability, self-luminescence, wide viewing angles, high color contrast, low power consumption, and flexibility provide a wide range of applications including full-color display, augmented reality/virtual reality technology, and wearable healthcare systems. In this review, we introduce three main types of multi-color LEDs: the organic LED, colloidal quantum dots (CQDs) LED, and CQD–organic hybrid LED. Various strategies for realizing multi-color LEDs are discussed including red, green, and blue sub-pixel side-by-side arrangement; vertically stacked LED unit configuration; and stacked emitter layers in a single LED. Finally, according to their status and challenges, we present an outlook of multi-color devices. We hope this review can inspire researchers and make a contribution to the further improvement of multi-color LED technology.

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Section: Double Emission Layersmentioning

confidence: 99%

Multi-Color Light-Emitting Diodes

et al. 2023

Coatings

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“…However, it is difficult to achieve both chromaticity tunability and high efficiency simultaneously. In recent years, several efforts have been made to devise the chromaticity-tunable OLEDs—for example, employment of color temperature tunable emitters, variant dopant concentrations [118], employment of appropriate host materials with suitable work function [119], shifting the ultra-thin yellow emissive layer position in a blue matrix of complementary emitter-based white OLED devices [120], and employment of nano CMLs [76,121]. Among these, the nano CML approach is considered to be the most favorable because of its numerous superlative characteristics, such as carrier regulation function, ability to confine the excitons within the specific emissive layer, and choice of materials for CML.…”

Section: Effect Of CML On Chromaticity Tuningmentioning

confidence: 99%

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

et al. 2015

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Organic light-emitting diode (OLED)-based display products have already emerged in the market and their efficiencies and lifetimes are sound at the comparatively low required luminance. To realize OLED for lighting application sooner, higher light quality and better power efficiency at elevated luminance are still demanded. This review reveals the advantages of incorporating a nano-scale carrier modulation layer (CML), also known as a spacer, carrier-regulating layer, or interlayer, among other terms, to tune the chromaticity and color temperature as well as to markedly improve the device efficiency and color rendering index (CRI) for numerous OLED devices. The functions of the CML can be enhanced as multiple layers and blend structures are employed. At proper thickness, the employment of CML enables the device to balance the distribution of carriers in the two emissive zones and achieve high device efficiencies and long operational lifetime while maintaining very high CRI. Moreover, we have also reviewed the effect of using CML on the most significant characteristics of OLEDs, namely: efficiency, luminance, life-time, CRI, SRI, chromaticity, and the color temperature, and see how the thickness tuning and selection of proper CML are crucial to effectively control the OLED device performance.

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“…In the last two decades, organic light emitting diode (OLED) technology has emerged as a promising contender in display technology [1] due to its remarkable properties, such as high contrast, wide viewing angles, and low power consumption [2,3]. One of the fascinating aspects of OLEDs is their capability to manipulate and control colors [4][5][6][7][8][9]. Currently, this forms a subject of great interest in both academia and industry.…”

Section: Introductionmentioning

confidence: 99%

Recombination zone shift in OLEDs of the pyrene- phenanthroimidazole conjugate giving cyan and green emission

Gupta,

Dixit,

Agarwal

et al. 2024

Phys. Scr.

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Phenanthroimidazole derivative with Pyrene (PhenI-Py), which is known to be a good blue emitter, has been used to make OLED devices. We report the tuning of the emission from green (peak emission at 535 nm) to cyan (peak emission at 495 nm) in OLEDs by changing the device geometry using different hole transporting layers (HTL). Cyan OLEDs reported a high external quantum efficiency (EQE) of ∼10%. By making devices with different thicknesses of the active layer and hole transporting layers (HTL), this wavelength shift could be understood on the basis of the shift in the recombination zone (RZ). Time resolved area normalized emission spectroscopy (TRANES) carried out in thin films of PhenI-Py indicated the dynamics of excited states, which seem to be responsible for the observed RZ shift. Thus, our results present an understanding of the mechanism of the observed colour tunability in devices of PhenI-Py.

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Tunable chromaticity stability in solution-processed organic light emitting devices

Cited by 8 publications

References 30 publications

Multi-Color Light-Emitting Diodes

Multi-Color Light-Emitting Diodes

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

Recombination zone shift in OLEDs of the pyrene- phenanthroimidazole conjugate giving cyan and green emission

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