Surface modification strategy based on molecular engineering of organic cation toward spectrally stable deep-blue emission perovskites

Author(s):  
Yifei Yue ◽  
Shengnan Liu ◽  
Baohua Zhang ◽  
Zhong-Min Su ◽  
Dongxia Zhu

All-inorganic perovskites (AIP) with three primary colors emission are all-important for AIP application in many field. However, poor spectral stability seriously hinders the development of blue-emission AIP. Here, we achieved...

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 193
Author(s):  
Jae Yong Jung ◽  
Juna Kim ◽  
Yang Do Kim ◽  
Young-Kuk Kim ◽  
Hee-Ryoung Cha ◽  
...  

Hexagonal boron nitride was synthesized by pyrolysis using boric acid and melamine. At this time, to impart luminescence, rare earth cerium ions were added to synthesize hexagonal boron nitride nanophosphor particles exhibiting deep blue emission. To investigate the changes in crystallinity and luminescence according to the re-heating temperature, samples which had been subjected to pyrolysis at 900 °C were subjected to re-heating from 1100 °C to 1400 °C. Crystallinity and luminescence were enhanced according to changes in the reheating temperature. The synthesized cerium ion-doped hexagonal boron nitride nanoparticle phosphor was applied to the anti-counterfeiting field to prepare an ink that can only be identified under UV light.


2015 ◽  
Vol 51 (53) ◽  
pp. 10632-10635 ◽  
Author(s):  
Chenglong Li ◽  
Shipan Wang ◽  
Weiping Chen ◽  
Jinbei Wei ◽  
Guochun Yang ◽  
...  

The strong deep blue emission, good ambipolar carrier transport and small singlet–triplet splitting characteristics allow PPI-PPITPA and PPI-PPIPCz as emitting materials and hosts to fabricate high performance full color OLEDs.


Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5568
Author(s):  
Jie Li ◽  
Heqi Gong ◽  
Jincheng Zhang ◽  
Hui Liu ◽  
Li Tao ◽  
...  

The realization of a deep-blue-emitting exciplex system is a herculean task in the field of organic light-emitting diodes (OLEDs) on account of a large red-shifted and broadened exciplex emission spectrum in comparison to those of the corresponding single compounds. Herein, 2,5,8-tris(di(4-fluorophenyl)amine)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3FDPA) was designed as an electron acceptor by integrating three bis(4-fluorophenyl)amine groups into a heptazine core, while 1,3-di(9H-carbazol-9-yl)benzene (mCP) possessing two electron-donating carbazole moieties was chosen as the electron donor. Excitingly, the exciplex system of 8 wt% HAP-3FDPA:mCP exhibited deep-blue emission and a high photoluminescence quantum yield of 53.2%. More importantly, an OLED containing this exciplex system as an emitting layer showed deep-blue emission with Commission Internationale de l’Eclairage coordinates of (0.16, 0.12), a peak luminance of 15,148 cd m−2, and a rather high maximum external quantum efficiency of 10.2% along with a low roll-off. This study not only reports an efficient exciplex-based deep-blue emitter but also presents a feasible pathway to construct highly efficient deep-blue OLEDs based on exciplex systems.


2021 ◽  
Author(s):  
XinYe Wang ◽  
Yuan Wu ◽  
ChuanMing Wu ◽  
Yixiang Li ◽  
Dongdong Wang ◽  
...  

Two novel molecular scaffolds, dibenzo[f,h]furo[2,3-b]quinoxaline (diBFQ) and its derivative, 3,6-bis(4-isopropylphenyls)-11-phenyldibenzo[f,h]furo[2,3-b]quinoxaline (dP-diBFQ), and furo[2',3':5,6]pyrazino[2,3-f][1,10]phenanthroline (FPPhen), were designed and syn-thesized for highly efficient pure and deep blue emission. The unsubstituted molecule scaffold...


2019 ◽  
Vol 124 (2) ◽  
pp. 1617-1622 ◽  
Author(s):  
Huafeng Shi ◽  
Xiaoli Zhang ◽  
Xiaowei Sun ◽  
Xinhai Zhang

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70085-70090 ◽  
Author(s):  
Haichao Liu ◽  
Qing Bai ◽  
Weijun Li ◽  
Yachen Guo ◽  
Liang Yao ◽  
...  

Acceptor–donor–acceptor triphenylamine–phenanthroimidazole derivate (TPA–2PPI) servers as an emitter, whose device exhibits deep-blue emission, high efficiency and slow roll-off of efficiency.


2018 ◽  
Vol 20 (17) ◽  
pp. 11867-11875 ◽  
Author(s):  
Iain A. Wright ◽  
Hameed A. Al-Attar ◽  
Andrei S. Batsanov ◽  
Andrew P. Monkman ◽  
Martin R. Bryce

Twelve bicarbazole derivatives with emission ranging from blue-green to deep-blue, and ET 2.6–3.0 eV.


2018 ◽  
Vol 6 (16) ◽  
pp. 4479-4484 ◽  
Author(s):  
Weixuan Zeng ◽  
Yongbiao Zhao ◽  
Weimin Ning ◽  
Shaolong Gong ◽  
Zece Zhu ◽  
...  

Two quaterphenyl derivatives are rationally designed and synthesized as deep-blue emitters to simultaneously afford outstanding device performance and excellent color purity approaching the NTSC blue standard.


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