High-performance narrow spectrum green phosphorescent top-emitting organic light-emitting devices with external quantum efficiency up to 38%

2021 ◽  
Author(s):  
Xiaokang Li ◽  
Wenxing Liu ◽  
Kai Chen ◽  
Ruixia Wu ◽  
Guo-Jun Liu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Performance ◽  
Cavity Length ◽  
Strong Dependence ◽  
Emission Peak ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Micro Cavity

Abstract In this work, we have experimentally demonstrated the efficacy of micro-cavity effect in realizing high-performance top-emitting organic light-emitting diodes (TEOLEDs). By optimizing the thickness of top Yb/Ag electrode and cavity length, highly efficient green TEOLED with external quantum efficiency as high as 38% was achieved. A strong dependence of electroluminescent (EL) performances and spectrum on cavity length was observed, and there was also a significant angle dependence of EL spectrum. Ultimately, ultra-high current efficiency up to 161.17 cd/A (3.2 V) was obtained by the device with emission peak at 552 nm, which is 35 nm longer than the intrinsic emission peak (517 nm) of utilized green emitter. Interestingly, this device displayed narrow emission with full-width at half-maximum (FWHM) of less than 20 nm, which was obtained by increasing the Ag layer thickness.

Green organic light-emitting devices with external quantum efficiency up to nearly 30% based on an iridium complex with a tetraphenylimidodiphosphinate ligand

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63200-63205 ◽  
Author(s):  
Yanan Li ◽  
Liang Zhou ◽  
Yunlong Jiang ◽  
Rongzhen Cui ◽  
Xuesen Zhao ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
High Performance ◽  
Iridium Complex ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light

High performance green electroluminescent device with maximum brightness, current efficiency, power efficiency and external quantum efficiency (EQE) up to 113 610 cd m−2, 112.30 cd A−1, 97.95 lm W−1 and 29.4%, was realized.

Deep-blue fluorescent emitter based on a 9,9-dioctylfluorene bridge with a hybridized local and charge-transfer excited state for organic light-emitting devices with EQE exceeding 8%

2020 ◽  
Vol 8 (40) ◽  
pp. 14117-14124
Author(s):  
Xing Liu ◽  
Wen Liu ◽  
Wu Dongyu ◽  
Xiaozhen Wei ◽  
Long Wang ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Blue Emission ◽  
Emission Peak ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Deep Blue ◽  
Organic Light

The doped device of TPA-DFCP exhibits excellent deep-blue emission with the EL emission peak at 436 nm and the CIE coordinates at (0.153, 0.077), and excellent EL performance with a maximum external quantum efficiency (EQE) of 8.30%.

Structurally robust phosphorescent [Pt(O^N^C^N)] emitters for high performance organic light-emitting devices with power efficiency up to 126 lm W−1 and external quantum efficiency over 20%

2014 ◽  
Vol 5 (12) ◽  
pp. 4819-4830 ◽  
Author(s):  
Gang Cheng ◽  
Steven C. F. Kui ◽  
Wai-Hung Ang ◽  
Man-Ying Ko ◽  
Pui-Keong Chow ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
High Performance ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
White Oled

Practical strongly phosphorescent platinum(II) green to white OLED emitters with bulky tetradentate O^N^C^N ligands.

scholarly journals Novel blue fluorescent emitters structured by linking triphenylamine and anthracene derivatives for organic light-emitting devices with EQE exceeding 5%

2019 ◽  
Vol 7 (35) ◽  
pp. 10810-10817 ◽  
Author(s):  
Jing Zhang ◽  
Yaping Zhao ◽  
Huixia Xu ◽  
Di Zhang ◽  
Yanqin Miao ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Anthracene Derivatives ◽  
Organic Light Emitting Devices

Two novel bipolar compounds of TPA-AN-NA and TPA-AN-TFP were designed by linking triphenylamine and anthracene derivatives. The TPA-AN-NA-based blue device achieves a high external quantum efficiency of 5.44% and a radiative exciton yield of 56.68%.

Influence of Device Configuration on External Quantum Efficiency in Organic Light-Emitting Devices

2000 ◽  
Vol 660 ◽  
Author(s):  
Masayuki Yahiro ◽  
Tetsuo Tsutsui
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Emission Spectra ◽  
Metal Electrode ◽  
Integrating Sphere ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Emissive Region ◽  
Organic Light Emitting Devices

ABSTRACTThe external quantum efficiency in conventional double-layer type organic light-emitting devices with different layer thickness was carefully evaluated. From the measurements of luminance and emission spectra, external quantum efficiency (uncorrected) was obtained.The correction due to the modification of spatial emission distribution was added from the measurements of spatial emission patterns. The external quantum efficiency, both uncorrected and corrected, showed strong dependency on the distance between a metal electrode and an emissive region. This variation was ascribed to the change of coupling-out efficiency. Independent experimental evaluations of apparent couple-out efficiency using an integrating sphere supported this interpretation.

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