Two pyridine-containing triphenylbenzene derivatives of 1,3,5-tri(m-pyrid- 3-yl-phenyl)benzene (TmPyPB) and 1,3,5-tri(p-pyrid-3-yl-phenyl) benzene (TpPyPB) (see figure) with high electron mobility triplet energy level were designed synthesized. Highly efficient blue green phosphorescent OLEDs achieved by using TmPyPB TpPyPB as an electron-transport layer, respectively.

A record high efficiency and reduced roll-off were achieved for blue phosphorescent OLEDs with novel bipolar host materials containing both carbazole electron donor pyridine acceptor because of good confinement triplet excitons on the guest molecules improved carrier balance injected into emissive layer.

The crystal structure and photoluminescence properties of undoped Ce3+-doped CaAlSiN3 as well the application white-light LEDs are reported. CaAlSiN3:Ce3+ have been synthesized, starting from Ca3N2, AlN, Si3N4, CeN or CeO2 with without Li3N, by a solid state reaction at 1700 °C for 4 h under high purity nitrogen atmosphere. Instead an ideal CaAlSiN3, more appropriate formula is proposed to be CaAl1−4δ/3Si1+δN3 (δ ≈ 0.3−0.4) Al/Si ratio about 1:2 on basis bond valence sum calculations, in...

We developed ultra high efficiency green organic light-emitting devices (OLEDs) using a novel electron transport material containing dipyridylphenyl moieties and phosphorescent emitter, fac tris(2-phenylpyridine)iridium, Ir(ppy)3. An OLED with simple structure of glass/indium–tin oxide/polymer buffer layer/arylamine derivative as hole layer/Ir(ppy)3-doped dicarbazolylbiphenyl an emitter layer/dipyridylphenyl layer/LiF/Al exhibited low drive voltages, which were 2.5 V at 100 cd/m2 2.9 1000...

β-Sialon:Eu2+ has been reported to be the most promising narrow-band green phosphor for wide color gamut LCD backlights, but coexistence of Eu3+ luminescence killer with Eu2+ center limits its performance a great extent. In this study, we propose direct reduction strategy successfully realize and, finally, increase effective concentration in crystal lattice and greatly minimize amount on particle surface. As result, treated β-sialon:Eu2+ is enhanced by 2.3 times, internal quantum efficiency...

Nitridosilicates are structurally built up on three-dimensional SiN4 tetrahedral networks, forming a very interesting class of materials with high thermomechanical properties, hardness, and wide band gap. Traditionally, nitridosilicates often used as structural such abrasive particles, cutting tools, turbine blade, etc. Recently, the luminescence rare earth doped has been extensively studied, novel family luminescent developed. This paper reviews synthesis, applications nitridosilicate...

As a next-generation high-power lighting technology, laser has attracted great attention in high-luminance applications. However, thermally robust and highly efficient color converters suitable for high-quality are scarce. Despite its versatility, the phosphor-in-glass (PiG) been seldom applied because of low thermal conductivity. In this work, we develop unique architecture which film was directly sintered on high conductive sapphire substrate coated by one-dimensional photonic crystals....

Color rendition, luminous efficacy and reliability are three key technical parameters for white light-emitting diodes (wLEDs) that dominantly determined by down-conversion phosphors. However, there is usually an inevitable trade-off between color rendition luminescence because the spectrum of red phosphor (that is, spectral broadness position) cannot satisfy them simultaneously. In this work, we report a very promising can minimize aforementioned via structure band-gap engineering, achieved...

Deep-trap persistent luminescence materials exhibit unique properties of energy storage and controllable photon release under additional stimulation, allowing for both wavelength intensity multiplexing to realize high-capacity in the next-generation information system. However, lack suitable with deep traps is bottleneck such technologies. In this study, we successfully developed a series novel deep-trap Ln2+/Ln3+-doped SrSi2O2N2 system (Ln2+ = Yb, Eu; Ln3+ Dy, Ho, Er) by applying strategy...

The narrow-band green-emitting phosphor Ba2LiSi7AlN12:Eu2+ was discovered by analyzing a single particle in powder mixture, which we call the diagnosis approach. Single crystal X-ray diffraction analysis of revealed that crystallizes Pnnm space group (No. 58) with = 14.0941 Å, b 4.8924 c 8.0645 and Z 2. structure is composed corner-sharing (Si,Al)N4 corrugated layer edge-sharing LiN4 tetrahedra. Ba(Eu) occupies one-dimensional channel zigzag manner. luminescence properties were also measured...

Various kinds of activated carbon/activated carbon fibers were used in the evaluation electrical double layer capacitors using method image analysis. The appropriate hydrated ion structures an aqueous system and organic carbonate calculated software Cerius2 (ver. 3.8). capacitance obtained varied with electrolyte used, even though capacitor material remained same. relationship between pore size diameter is discussed. © 2001 Electrochemical Society. All rights reserved.

An ultra high efficiency blue organic light-emitting device using wide-energy-gap electron-transport material containing 3,5-dipyridylphenyl moieties and phosphorescent emitter, FIrpic, was developed. The optimized showed extremely power efficiencies of 56 lm/W (53 cd/A) at 100 cd/m2 42 (46 1000 without light outcoupling enhancement.

Abstract Three triphenyl benzene derivatives of 1,3,5‐tri( m ‐pyrid‐2‐yl‐phenyl)benzene (Tm2PyPB), ‐pyrid‐3‐yl‐phenyl)benzene (Tm3PyPB) and ‐pyrid‐4‐yl‐phenyl)benzene (Tm4PyPB), containing pyridine rings at the periphery, are developed as electron‐transport hole/exciton‐blocking materials for iridium(III) bis(4,6‐(di‐fluorophenyl)pyridinato‐ N , C 2′ )picolinate (FIrpic)‐based blue phosphorescent organic light‐emitting devices. Their highest occupied molecular orbital lowest unoccupied...

This work reports a wide color gamut backlight for liquid crystal display (LCD) utilizing three-band white light-emitting diodes (LED). The LED was fabricated by combining blue chip with β-sialon:Eu (green) and CaAlSiN3:Eu (red) phosphors. 2-phosphor-converted shows discrete spectrum distinct separation of red, green, primary colors due to narrow asymmetric emission band the green phosphor. By applying typical filters LCDs color-matching functions, 91.9% National Television Standard...

Abstract Tris-[3-(3-pyridyl)mesityl]borane (3TPYMB) with high triplet excited energy level was synthesized and investigated as an electron-transport material for organic light-emitting devices (OLEDs). Larger current density higher luminance were observed the OLED using 3TPYMB, compared a conventional material, tris(8-quinolinolato)aluminum (Alq3).

Discovery of novel luminescent materials is fundamental importance in the advancement solid state lighting and flat panel display technologies. In this work, we report a single-particle-diagnosis method for discovery new phosphors by just characterizing crystalline particle as small 10 μm diameter. We explored single-particle fluorescence imaging spectroscopy techniques to evaluate photoluminescence phosphor distinguished from complex powder mixture applied high-resolution single-crystal...

Abstract Robust ceramic color converters withstanding strong laser irradiations have recently drawn great attention for laser‐driven white lighting. However, the local emission within incident spot usually expands to whole surface area of ceramics, which definitely makes it hard achieve light with high luminance and directionality. Herein, a new strategy is proposed solve problem by elaborately introducing uniform spherical pores (diameter ≈2 µm) into phosphor ceramics controlled contents...

Clarification of thermal saturation helps to guide the design high-brightness yellow and green components for laser lighting displays.

Detailed microstructures and performances as well the relationships between them have been analyzed.

Upon UV or blue light excitation, the codoped γ-AlON phosphor has higher luminescence intensity, quantum efficiency and thermal stability than Mn²⁺-doped due to energy transfer low total concentration of Ce³⁺ Mn²⁺ ions.

Abstract Laser‐driven solid‐state lighting with super‐brightness and compactness is recognized as a promising alternative to white light‐emitting diodes. However, it quite difficult achieve laser‐driven warm light long‐term stability due the shortage of robust orange‐ or red‐emitting laser phosphors. In this work, an efficient thermally orange‐red (La,Y) 3 Si 6 N 11 :Ce 3+ (LYSN)‐BN phosphor‐in‐glass (PiG) film proposed realize light, where h ‐BN acts optical medium enhance scattering, heat...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Rong-Jun Xie, Naoto Hirosaki, Xue-Jian Liu, Takashi Takeda, Hui-Li Li; Crystal structure photoluminescence of Mn2+–Mg2+ codoped gamma aluminum oxynitride (γ-AlON)⁠: A promising green phosphor for white light-emitting diodes. Appl. Phys. Lett. 19 May 2008; 92 (20): 201905. https://doi.org/10.1063/1.2920190...

A series of four-pyridylbenzene-armed biphenyl derivatives were designed and synthesized as an electron-transport exciton- hole-block layer for the fac-tris(2-phenylpyridine)iridium (Ir(PPy)3)-based green phosphorescent organic light-emitting devices (OLEDs), giving improved efficiency in comparison to that with both tris(8-hydroxyquinoline)aluminum (Alq3) 2,9-dimethyl-4,7-diphenylphenathroline (BCP).