Improved color purity and efficiency by a coguest emitter system in doped red light-emitting devices

2007 ◽  
Vol 122-123 ◽  
pp. 636-638 ◽  
Author(s):  
Jiangshan Chen ◽  
Dongge Ma
Keyword(s):  
Red Light ◽  
Color Purity ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Emitter System

Driving and Application of Blue Light Organic Light Emitting Devices

2019 ◽  
Vol 11 (5) ◽  
pp. 711-717
Author(s):  
Hongbo Liu ◽  
Minghui Liu ◽  
Lin Cong ◽  
Lizhong Wang ◽  
Tao Huang ◽  
...  
Keyword(s):  
Blue Light ◽  
High Efficiency ◽  
Low Voltage ◽  
Red Light ◽  
Portable Devices ◽  
Driving Voltage ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

The DPVBi (4,4′-bis(2,2-diphenylvinyl-1,1′-biphenyl) is a blue-light organic fluorescence doped material, which can be used as a hole barrier layer or a luminescent layer for fabricating organic light-emitting devices. A blue light device with stable color stability and high efficiency was prepared by co-doping blue light dye DPVBi and red light dye DCJTB as light-emitting layer. In order to prevent the infiltration of O2 and moisture inside the device from affecting the luminescence lifetime of the device, the device was encapsulated by atomic layer deposition. Since the driving voltage of the organic light-emitting device is generally above 5 V and the power consumption is low, in order to facilitate driving with a low voltage, a boost driving circuit based on the XL6009 chip was designed. The driver of the fabricated blue-light device was tested. The results showed that circuit had low-voltage drive characteristics and could be widely used in small toys, lighting, and portable devices. Through the test to achieve the desired goal, the requirements of low voltage and low energy consumption were realized, and the life of the light-emitting device can be tested, which has certain practicability and reference value.

Improvement of efficiency and color purity utilizing two-step energy transfer for red organic light-emitting devices

2002 ◽  
Vol 81 (16) ◽  
pp. 2935-2937 ◽  
Author(s):  
Jing Feng ◽  
Feng Li ◽  
Wenbao Gao ◽  
Gang Cheng ◽  
Wenfa Xie ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Color Purity ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Bright red light-emitting devices based on a novel europium complex doped into polyvinylcarbazole

2007 ◽  
Vol 31 (4) ◽  
pp. 569 ◽  
Author(s):  
Yong Zhang ◽  
Chun Li ◽  
Huahong Shi ◽  
Bin Du ◽  
Wei Yang ◽  
...  
Keyword(s):  
Red Light ◽  
Europium Complex ◽  
Light Emitting ◽  
Light Emitting Devices

High-performance organic red-light-emitting devices based on a greenish-yellow-light-emitting host and long-wavelength emitting dopant

2006 ◽  
Vol 88 (18) ◽  
pp. 183504 ◽  
Author(s):  
Siewling Chew ◽  
Pengfei Wang ◽  
Zirou Hong ◽  
Silu Tao ◽  
Jianxin Tang ◽  
...  
Keyword(s):  
High Performance ◽  
Red Light ◽  
Yellow Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Long Wavelength ◽  
Greenish Yellow

scholarly journals A Novel Red-Emitting Na2NbOF5:Mn4+ Phosphor with Ultrahigh Color Purity for Warm White Lighting and Wide-Gamut Backlight Displays

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5317
Author(s):  
Jingshan Hou ◽  
Wenxiang Yin ◽  
Langping Dong ◽  
Yang Li ◽  
Yufeng Liu ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emission ◽  
Light Emitting Diode ◽  
Red Light ◽  
Luminescent Properties ◽  
Fluorescence Decay ◽  
Color Temperature ◽  
Color Purity ◽  
Zero Phonon Line ◽  
Light Emitting

In this work, a novel red-emitting oxyfluoride phosphor Na2NbOF5:Mn4+ with an ultra-intense zero-phonon line (ZPL) was successfully synthesized by hydrothermal method. The phase composition and luminescent properties of Na2NbOF5:Mn4+ were studied in detail. The photoluminescence excitation spectrum contains two intense excitation bands centered at 369 and 470 nm, which match well with commercial UV and blue light-emitting diode (LED) chips. When excited by 470 nm blue light, Na2NbOF5:Mn4+ exhibits red light emission dominated by ZPL. Notably, the color purity of the Na2NbOF5:Mn4+ red phosphor can reach 99.9%. Meanwhile, the Na2NbOF5:Mn4+ phosphor has a shorter fluorescence decay time than commercial K2SiF6:Mn4+, which is conducive to fast switching of images in display applications. Profiting from the intense ZPL, white light-emitting diode (WLED) with high color rendering index of Ra = 86.2 and low correlated color temperature of Tc = 3133 K is realized using yellow YAG:Ce3+ and red Na2NbOF5:Mn4+ phosphor. The WLED fabricated using CsPbBr3 quantum dots (QDs) and red Na2NbOF5:Mn4+ phosphor shows a wide color gamut of 127.56% NTSC (National Television Standard Committee). The results show that red-emitting Na2NbOF5:Mn4+ phosphor has potential application prospects in WLED lighting and display backlight.

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