Papers by Keyword: Blue

Abstract: A novel interacting multiple model based on BLUE filter (IMM-BLUE) for tracking a maneuvering target using radar/ESM heterogeneous sensors is presented in this paper. Under the architecture of the proposed algorithm, the interacting multiple model (IMM) deals with the model switching, while the BLUE filter accounts for non-linearity in the dynamic system models. The simulation results show that the presented IMM-BLUE has higher tracking precision than the IMM-DCM, and IMM-EKF.

Abstract:

Two iridium complexes, orange emitter bis[2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl- pyridinto-C³, N] iridium (acetylacetonate) ((fl-5CF₃-py)₂Ir(acac)) and blue emitter bis(4,6-difluoro- phenylpyridine)(picolinate) iridium(III) (FIrPic), were used. As a single emitting layer at the constant emitting concentration of 8 wt %, EL spectra of the device containing the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (8 wt %) peaked at 588 nm, the device having the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (2 wt %): FIrPic (6 wt %) showed the main peak at 588 nm and the weak shoulder peaks at 472 and 500 nm, the device containing the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (0.2 wt %): FIrPic (7.8 wt %) exhibited the main peak at 580 nm and slightly higher shoulder peaks at 472 and 500 nm. The device having the double emitting layers CBP: (fl-5CF₃-py)₂Ir(acac) (5 wt %) by spin-coating method and mCP: FIrPic (8 wt %) by vacuum deposition showed the main peaks at 472 and 500 nm, and shoulder peak at 580 nm. Maximum luminances of devices were found to be 14582 cd/m² (at 16 V), 12497 cd/m² (at 17 V), 1061 cd/m² (at 23 V), and 5396 cd/m² (at 25 V), respectively. The absence of host PVK, PBD, mCP or CBP emission in these devices indicated an efficient energy transfer from the host to the guest complex. Holes and electrons were efficiently recombined in the double emitting layers and an important approach for making WOLEDs was provided in the future.

Abstract: Multiternary nitride and oxynitride compounds doped with rare earth ions, such as Eu2+ and Ce3+ have been enthusiastically applied as various phosphors to white LED. New red and green phosphors, CaAlSiN3:Eu and Ba3Si6O12N2:Eu, have been successfully synthesized, recently. The red phosphor has intense emission around 650 nm under two different irradiations at 405 and 455 nm from blue- and near UV-LED chips, respectively; while strong emission is observed around 520 nm from the green phosphor. Both phosphors also show small thermal quenching over the temperatures up to 150 °C. In addition, both LaSi3N5:Ce and La3Si8O4N11:Ce in lanthanum silicon nitride and oxynitride were examined as candidates for a blue phosphor in white LED with near UV-LED chip.

Abstract: In this paper, we describe the performance of an organic light emitting devices〔OLEDs〕 with ITO /4,4’,4“-tris{N,- （ 3-methylphenyl ） -N-phenylamino}triphenylamine (m-MTDATA) /N,N-diphenyl-N,N-bis1-naphthyl-1,1-biphenyl-4,4-diamine (NPB) /copper phthalocyanine (CuPc) / NPB / Bathocuproine(BCP) / tris-8-hydroxyquinoline Aluminum (Alq3) / LiF/ AL structure, the CuPc inserted between the two layers of NPB as a hole-consuming layer (HCL), and the BCP as a hole-blocking layer (HBL) . The EL spectrum peak is at 430 nm, indicating that the carrier recombination is confined in the NPB layer, in additional light emission originates from NPB. Compared with the luminous efficiency of the conventional diode without CuPc layer, that of the diode with HCL has been sharply increased up to 2.62 cd /A. It suggested that the CuPc and BCP exactly function as hole-consuming and hole-blocking layers, respectively, which enhance the efficiency of carrier，s recombination and confine the excitation in the EL layer.

Abstract: A novel derivative of oligo(phenylenvinylene) (OPV), 2,5-diphenyl -1, 4-distyrylbenzene with two trans-double bonds (trans-DPDSB), is used as a blue emitting material in blue and white organic light-emitting devices (OLEDs). Blue devices with a configuration of indium-tin oxide (ITO)/N,N´-diphenyl-N,N´-bis(1-naphthyl)-(1,1´-biphenyl)-4,4´-diamine (NPB)/ trans-DPDSB / tris (8-hydroxyquinoline) aluminum (Alq3)/LiF/Al are constructed, where NPB, Alq3 and trans-DPDSB are used as hole-transporting, electron-transporting and light-emitting layers, respectively. The color of emission is changed from blue-green to pure blue when the trans-DPDSB layer is thicker. By inserting an ultrathin 5,6,11,12-tetraphenylnaphthacene (rubrene) yellow light-emitting layer between the Alq3 and trans-DPDSB layers, white OLEDs are obtained. The maximum efficiency and luminance of the blue and white devices are 1.2, 3.0 cd/A, and 1400, 7000 cd/m2, respectively.