color purity
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2022 ◽  
Vol 429 ◽  
pp. 132464
Author(s):  
Sun-Hyoung Lee ◽  
Seung-Won Song ◽  
Suk-Young Yoon ◽  
Dae-Yeon Jo ◽  
Sun-Kyo Kim ◽  
...  

2022 ◽  
Vol 17 (1) ◽  
Author(s):  
Zhi Ting Ye ◽  
Jun-Yi Wu

Abstract A common full-color method involves combining micro-light-emitting diodes (LEDs) chips with color conversion materials such as quantum dots (QDs) to achieve full color. However, during color conversion between micro-LEDs and QDs, QDs cannot completely absorb incident wavelengths cause the emission wavelengths that including incident wavelengths and converted wavelength through QDs, which compromises color purity. The present paper proposes the use of a recycling-reflection color-purity-enhancement film (RCPEF) to reflect the incident wavelength multiple times and, consequently, prevent wavelength mixing after QDs conversion. This RCPEF only allows the light of a specific wavelength to pass through it, exciting blue light is reflected back to the red and green QDs layer. The prototype experiment indicated that with an excitation light source wavelength of 445.5 nm, the use of green QDs and RCPEFs increased color purity from 77.2% to 97.49% and light conversion efficiency by 1.97 times and the use of red QDs and RCPEFs increased color purity to 94.68% and light conversion efficiency by 1.46 times. Thus, high efficiency and color purity were achieved for micro-LEDs displays. Graphical Abstract


2022 ◽  
Vol 20 (2) ◽  
pp. 021601
Author(s):  
Jintong Liu ◽  
Kun Feng ◽  
Yusi Wang ◽  
Qingyuan Li ◽  
Nan Chen ◽  
...  

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 810-821
Author(s):  
Yuichi Kitagawa ◽  
Makoto Tsurui ◽  
Yasuchika Hasegawa

In this review, we summarize the research progress on π-conjugated Eu(iii) luminophores exhibiting bright emission and their physical sensing applications.


2022 ◽  
Author(s):  
Prasenjit Prasad Sukul ◽  
Kaushal Kumar ◽  
Hendrik Christoffel Swart

Borate oxyfluoride glasses are transparent in the infra-red, ultra violet and visible regions and represent an ideal host matrix for optically active dopants. Due to their lower phonon energies compared...


2021 ◽  
Author(s):  
He Zhang ◽  
Dongqing Lin ◽  
Huifang Liu ◽  
Wei Liu ◽  
Yang-Cheng Wang ◽  
...  

Abstract Effectively protection against photooxidation of wide bandgap semiconductors remains a challenge that become the bottleneck on the road to commercialization. Herein, we demonstrated the crystallization effects of fluorene-based blue emitters on long-wavelength green band (g-band) defect with the well-defined organic micro/nanocrystals obtained via the self-assembly of surfactant-assisted reprecipitation methods. For the key molecule model 2,2'-bi(9,9-dipropyl)fluorene (DDC3F), the self-assembled nanorods film ex-hibits an ultrastable spectral stability without the presence of g-band emission (530 nm), and even main-tains the deep-blue emission under ultraviolet exposure (~ 3 h). In contrast, the spin-coated amorphous film shows a poor color purity with a green-index of ~ 4. Our results offer a robust evidence on the princi-ple in aggregate-enhanced stability, which is severely ignored by the general application of amorphously glassy molecules in OLED devices. In addition, the single nanorod as Fabry-Pérot (FP) optical resonator exhibits size-dependent dual wavelength lasing at 392 nm (threshold: 102 mW/cm2) and 412 nm (threshold: 216 mW/cm2), and generates the deep-blue electroluminescence in solution-processing OLED devices. The supramolecular self-assembled micro/nanocrystals strategy provides a potential platform to maintain ultrastable color purity in wide-bandgap optoelectronic device.


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