scholarly journals Intense green luminescence in Mn-doped gallogermanate nanostructured glass

Author(s):  
Xiaoyun Xu ◽  
Yingying Xing ◽  
Ziyue Yang

Abstract Mn activated optical materials have been demonstrated to be promising for various applications such as light-emitting device, tunable lasers and smart sensors. Most of the candidates belong to the single crystals and crystalline powders and few reports involve about the glass-derived materials. In this letter, we report the fabrication of active Mn-doped nanostructured glass sample via control of the crystallization of a typical gallogermanate glass. LiGa5O8 and LiGaGeO4 can precipitate after heat-treatment and Mn centers selectively incorporate into the crystalline phase. Importantly, the luminescence can be switched from red to green color and the intensity can be simultaneously enhanced. Furthermore, the luminescence properties can be tuned via control of the phase of the nanostructured glass. The approach should be general to various transition metal dopant, thus may potentially pave an effective way for functionalization of glass and expand the category of the active optical materials.

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 843
Author(s):  
Woo Jin Jeong ◽  
Jong Ik Lee ◽  
Hee Jung Kwak ◽  
Jae Min Jeon ◽  
Dong Yeol Shin ◽  
...  

We investigated the performance of single-structured light-emitting electrochemical cell (LEC) devices with Ru(bpy)3(PF6)2 polymer composite as an emission layer by controlling thickness and heat treatment. When the thickness was smaller than 120–150 nm, the device performance decreased because of the low optical properties and non-dense surface properties. On the other hand, when the thickness was over than 150 nm, the device had too high surface roughness, resulting in high-efficiency roll-off and poor device stability. With 150 nm thickness, the absorbance increased, and the surface roughness was low and dense, resulting in increased device characteristics and better stability. The heat treatment effect further improved the surface properties, thus improving the device characteristics. In particular, the external quantum efficiency (EQE) reduction rate was shallow at 100 °C, which indicates that the LEC device has stable operating characteristics. The LEC device exhibited a maximum luminance of 3532 cd/m2 and an EQE of 1.14% under 150 nm thickness and 100 °C heat treatment.


2021 ◽  
Vol 11 (6) ◽  
pp. 2828
Author(s):  
Byoung-Seong Jeong

In this study, the optimal structure for obtaining high green color purity was investigated by modeling quantum dot (QD)–organic light-emitting diodes (OLED). It was found that even if the green quantum dot (G-QD) density in the G-QD layer was 30%, the full width at half maximum (FWHM) in the green wavelength band could be minimized to achieve a sharp emission spectrum, but it was difficult to completely block the blue light leakage with the G-QD layer alone. This blue light leakage problem was solved by stacking a green color filter (G-CF) layer on top of the G-QD layer. When G-CF thickness 5 μm was stacked, blue light leakage was blocked completely, and the FWHM of the emission spectrum in the green wavelength band was minimized, resulting in high green color purity. It is expected that the overall color gamut of QD-OLED can be improved by optimizing the device that shows such excellent green color purity.


2008 ◽  
Vol 53 (9(2)) ◽  
pp. 953-957
Author(s):  
S. Y. Park ◽  
Y. S. Lee ◽  
Y. P. Lee ◽  
J. Y. Rhee ◽  
J-H. Kang
Keyword(s):  
Zno Film ◽  

2004 ◽  
Vol 212 (1) ◽  
pp. 225-230
Author(s):  
Frank Janssen ◽  
Marco Sturm ◽  
Leo van Ijzendoorn ◽  
Arnoud Denier van der Gon ◽  
Herman Schoo ◽  
...  

2010 ◽  
Vol 107 (2) ◽  
pp. 024316 ◽  
Author(s):  
Kajari Das ◽  
Shailesh N. Sharma ◽  
Mahesh Kumar ◽  
S. K. De

2019 ◽  
Vol 7 (32) ◽  
pp. 9808-9812 ◽  
Author(s):  
Bin Huang ◽  
Dawei Jiang ◽  
Yan Feng ◽  
Wen-Cheng Chen ◽  
Ying Zhang ◽  
...  

A novel donor–acceptor emitter exhibiting mechanochromic luminescence was used in light-emitting devices with tunable colors triggered by heat treatment.


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