Enhanced performance of polymer light‐emitting device via optimization of processing conditions and device configuration

Abstract

ABSTRACT:The improved performance of polyalkylfluorene light-emitting device has been achieved through the optimization of processing conditions and device configuration. The current density, brightness, power efficiency, and operation lifetime of polymer light-emitting device (PLED) were strongly dependent on the surface treatment of anode, the film thickness of light-emitting polymer (LEP), and the cathode configuration. The anode surface treated with O 2 plasma exhibited a higher current density and brightness than the CF 4 plasma treated device. However, better operation stability was obtained for the CF 4 plasma treated device than for the O 2 plasma treated device. The maximum of brightness and power efficiency has been achieved for the PLED with an LEP thickness of 80 nm. The PLED with LiF/Ca/Al cathode possesses a better power efficiency and operation stability than does the Ca/Al or LiF/Al based PLED. The influences of device fabrication conditions and device configuration on the performance of a polyalkylfluorene-based PLED are discussed in detail.

Efficient fluorescent red, green, and blue organic light-emitting devices with a blue host of spirobifluorene derivative

“…The electroluminescence CIE coordinates (x = 0.53-54, y = 0. [45][46] were obtained as a driving voltage range from 8 V to 12 V. Yellow-orange emission was observed for the 2% DCJTB-doped TBPSF device D2. Device D2 shows lower color purity than the one based on the host material of Alq 3 [19,20].…”

“…In addition, current efficiency starts to decay at elevated current densities or driving voltages. This phenomenon is usually observed in small molecule based OLED devices or light emitting polymer based devices [43][44][45]. Current efficiency decay is presumably due to unbalanced charges of electron and hole in the device at elevated driving voltages.…”

Enhancing the electroluminescence performances of blue polymer light emitting devices via carriers transporting materials incorporation

“…EL performances are also dependent on light emitting layer thickness. 12 However, the brightness and efficiency of device II-50 is not better than device II-25. This is possibly due to unbalanced electron and hole for device II-50.…”

“…1,2 Electroluminescence (EL) performance of PLED is determined by intrinsic property of light emitting polymer (LEP), 3,4 device processing parameters, [5][6][7][8][9][10][11] and device configuration. 12 Charge balance throughout the device plays a key role for fabricating PLEDs with excellent EL properties, such as high brightness, high efficiency, and high operation stability. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Adopting various strategies achieves a charge balance throughout the device resulting in PLED with excellent EL performance.…”

Enhancing the electroluminescence properties of novel blue light emitting polymer and MEH‐PPV based white light emitting polymer devices by processing condition optimization

“…Electric leakage is likely to occur as a result during PLED operation processes because of defect presence. 44 Consequently, low current efficiency was obtained for PLED with a thinner light-emitting layer.…”