Deep blue, efficient, moderate microcavity organic light-emitting diodes

Kim, Hyoung Kun; Cho, Sang‐Hwan; Oh, Jeong Rok; Lee, Jun Young; Lee, Jun-Ho; Lee, Jaegab; Kim, Soo‐Kang; Park, Young‐Il; Park, Jong‐Wook; Rag, Young

doi:10.1016/j.orgel.2009.10.011

Cited by 34 publications

(13 citation statements)

References 32 publications

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“…[1][2][3] In addition, it has been reported that microcavity structure can be used to enhance the light extraction of an OLED by modifying the light distribution within the device. [4][5][6][7] However, closely examining the previous reports, there is a significant difference in luminance enhancements in different microcavity OLEDs. While two times enhancement in current efficiency has been observed in green microcavity OLEDs, no significant improvements were reported in blue microcavity devices.…”

Section: Introductionmentioning

confidence: 70%

A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

et al. 2013

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A systematic study has been conducted on microcavity organic light emitting diodes (OLEDs) based on green, red and blue phosphorescent emitters to elucidate the microcavity effects for different color emitters. We found that the luminance output is determined by the reflectivity of the semitransparent electrode and the photopic response of the green, red and blue emitters. While the luminance enhancements of blue and red phosphorescent microcavity devices are small, a current efficiency as high as 224 cd A 21 is obtained in the green phosphorescent microcavity OLEDs.

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Section: Introductionmentioning

confidence: 70%

A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

et al. 2013

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“…In our blue OLED structure, a single pair of low (SiO 2 ) -and high (TiO 2 )-index layers is added between ITO and the glass substrate in order to increase the top reflectivity. Recently, our group reported a moderate microcavity OLED containing a single pair of lowand high-index layers with a finely tunable peak position and a bandwidth of EL emission that achieved enhanced external efficiency [12,13].…”

Section: Resultsmentioning

confidence: 99%

“…In this letter, we demonstrate a highly efficient pc-WOLED combined with both a moderate microcavity structure [12,13] and light-recycling filters (LRFs) [14]. In order to enhance the forward efficiency of a blue OLED and modify the emission spectrum, we insert a single pair of low-and high-index layers (SiO 2 /TiO 2 ) between indium tin oxide (ITO) and a glass substrate to serve as a Bragg mirror, thus achieving improved emission characteristics, tunabilty of peak position, and spectral narrowness of blue emission.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient phosphor-converted white organic light-emitting diodes with moderate microcavity and light-recycling filters

Cho¹,

Oh²,

Park³

et al. 2010

Opt. Express

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We demonstrate the combined effects of a microcavity structure and light-recycling filters (LRFs) on the forward electrical efficiency of phosphor-converted white organic light-emitting diodes (pc-WOLEDs). The introduction of a single pair of low- and high-index layers (SiO(2)/TiO(2)) improves the blue emission from blue OLED and the insertion of blue-passing and yellow-reflecting LRFs enhances the forward yellow emission from the YAG:Ce(3+) phosphors layers. The enhancement of the luminous efficacy of the forward white emission is 1.92 times that of a conventional pc-WOLED with color coordinates of (0.34, 0.34) and a correlated color temperature of about 4800 K.

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“…For the reason, there has been tremendous interests to develop blue emitting materials with pure and highly efficient [12,13]. Efforts to achieve highly efficient blue emitting materials have sought to 1) control the emission wavelength by managing the properties of the π-conjugation system in molecules that have high quantum efficiencies, such as anthracene, fluorine and pyrene (see Figure 2) 2) reduce packing between molecules and limit emission quenching by introducing bulky side groups.…”

Section: Research Highlight In Blue Fluorescent Emittersmentioning

confidence: 99%

Recent Research Highlights in Blue Fluorescent Emitters in Organic Light-Emitting Diodes

Kim¹,

Seo²,

Cho³

2014

Applied Chemistry for Engineering

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Organic light emitting diodes (OLEDs) received much attention from both academia and industry as the next-generation flat panel displays. However, to produce high quality OLEDs, there are still many challenges to overcome. Especially, in full color OLEDs, the intrinsic wide band gap of the blue emitting materials results in inferior efficiency compared to those of green and red emitting materials. Therefore, extensive research efforts have been devoted to develop efficient blue emitting materials. This review briefly summarizes the basics of OLEDs and introduces highlights of research efforts in blue-emitting materials.

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Deep blue, efficient, moderate microcavity organic light-emitting diodes

Cited by 34 publications

References 32 publications

A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

Highly efficient phosphor-converted white organic light-emitting diodes with moderate microcavity and light-recycling filters

Recent Research Highlights in Blue Fluorescent Emitters in Organic Light-Emitting Diodes

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