Photoluminescence of Eu-Doped ZnO Phosphors

Hayashi, Yujiro; Narahara, Hidetoshi; Uchida, Takahisa; Noguchi, Tohru; Ibuki, Sumiaki

doi:10.1143/jjap.34.1878

Cited by 60 publications

(43 citation statements)

References 8 publications

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“…The polycrystalline-ZnO samples, doped with Eu 2 O 3 or EuCl 3 baked in dry air at 1,100°C for 3 h, show weak line emission of Eu 3ϩ ions ( 5 D 0 → 7 F 2 transition) observed on a broad band of host luminescence at room temperature. 15 Recently, pure-red-emitting phosphor was synthesized using ZnO:EuCl 3 pellets sintered at 1,100°C in a vacuum. 16,17 This was the first successful attempt that demonstrated that the SA band at 530 nm can be completely suppressed in the PL emission spectrum.…”

Section: Discussionmentioning

confidence: 99%

“…In the past, most extensively studied was luminescence of trivalent RE 3ϩ ions from sintered ZnO-polycrystalline pellets. [9][10][11][12][13][14][15][16][17][18] It was found that the addition of various coactivators mainly lithium ions, [10][11][12][13][14][15][16][17] nitrogen, 18 or chlorine [15][16][17] compounds usually results in an increase of the luminescence intensity of RE 3ϩ ions and a decrease of the intrinsic luminescence of the semiconductor host.…”

Section: Introductionmentioning

confidence: 99%

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Visible emission from ZnO doped with rare-earth ions

Jadwisienczak

Łożykowski

et al. 2002

Journal of Elec Materi

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INTRODUCTIONThe ZnO (wurtzite) is a wide bandgap (3.437 eV at 2 K), naturally n-type semiconductor with a large exciton-binding energy of 60 meV that has attracted much recent attention. The recently reported ability to obtain p-type ZnO 1-5 opens up novel possibilities for optoelectronic light-emitting devices, including lasers operating in the near ultraviolet (UV) and blue spectral range. The low-temperature photoluminescence (PL) emission is dominated by the neutral donor-bound exciton (D°,X) complexes 6 and the green band near 2.4 eV. 7 The mechanism of the green emission is not still completely understood. In the literature are several models relating the green luminescence to transitions between energy levels of interstitial Zn or O vacancy to Zn vacancy. The two different shallow donors, acceptor phonon-assisted recombination is the most probable model. 7 The red and yellow low-intensity luminescence from ZnO is also reported, which are related to impurities. 8 The ZnO can be grown as a large-scale, high-quality bulk and thin-film crystals and possesses a potential as a host for rare-earth (RE) ions doping. When excited by proper radiation, hot carriers-impact excitation, or carriers injected in the p-n junction structure, this material has the potential to display luminescence over wavelengths from UV to infrared and can have applications in electroluminescence (EL) and cathodoluminescence (CL) displays and other optoelectronics devices. However, up to now, the research showed that the main obstacle of ZnO host doped with RE ions is relatively poor luminescence from RE centers compared to that from excitonic emission or self-activated (SA) host centers. In the past, most extensively studied was luminescence of trivalent RE 3ϩ ions from sintered ZnO-polycrystalline pellets. 9-18 It was found that the addition of various coactivators mainly lithium ions, 10-17 nitrogen, 18 or chlorine 15-17 compounds usually results in an increase of the luminescence intensity of RE 3ϩ ions and a decrease of the intrinsic luminescence of the semiconductor host.In this article, we present results of a spectroscopic study on luminescence of RE 3ϩ ions embedded into ZnO bulk and thin-film single-crystal semiconductor hosts. To our knowledge, this is the first report of the visible emission of RE ions Pr 3ϩ , Sm 3ϩ , Dy 3ϩ , Ho 3ϩ , and Tm 3ϩ incorporated into ZnO single crystal. We also study the sintered polycrystallineZnO:RE pellets, co-doped with Li, Cl, and N ions. EXPERIMENTThe ZnO material used in this investigation was undoped 10 mm ϫ 10 mm ϫ 0.5-mm melt-grown crystals by Cermet, Inc., Atlanta, GA and ϳ0.5-mthick epilayer thin-film samples grown on a 1-in.-diameter sapphire (0001) substrate by S & R Rubicon, Inc., Chicago IL. The ZnO single crystals and thinfilm samples are oriented with the c axis perpendicuWe report the results of a cathodoluminescence (CL) and photoluminescence (PL) study of ZnO-bulk single crystals and epilayer thin-film samples grown on a sapphire (0001) substrate and doped by implantation with ra...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible emission from ZnO doped with rare-earth ions

Jadwisienczak

Łożykowski

et al. 2002

Journal of Elec Materi

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“…It has been established, however, that Eu doping in ZnO results in a very weak red luminescence. [6,20,21] Park et al [21] also demonstrated that this luminescence is assisted by the presence of impurities, in particular a chlorine impurity. As Eu is well known to show strong luminescence in a Y-containing environment, [8,22] it would be reasonable to study by combinatorial method the ZnO, which is co-doped by both Y and Eu, in the search of a new red-emitting phosphor.…”

Section: The Choice Of Multicomponent Systems For Combinatorial Explomentioning

confidence: 99%

Discovery and Optimization of New ZnO‐Based Phosphors Using a Combinatorial Method

Мордкович¹,

Hayashi

Haemori

et al. 2003

Adv Funct Materials

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The combinatorial method, which was exclusively employed for the drug discovery until recently, has invaded the field of inorganic materials and is becoming a key technology in materials science today. Phosphors, with their diversity of possible mechanisms of luminescence, represent a typical example of a field where the combinatorial approach promises to be especially fruitful. Here, we present the results of systematic combinatorial exploration of different binary and ternary ZnO:dopant systems, which resulted in identification of bright luminescence in ZnO:(Y,Eu), ZnO:V, ZnO:W, and ZnO:(W,Mg) systems. Careful “zooming in”, i.e., fabrication and screening of more detailed libraries near the identified promising compositions, allowed us to find optimum phosphor compositions for the above‐mentioned systems. The efficiency of the new phosphors in low‐voltage cathodoluminescence is high and promises their prospective use in advanced flat panel display and lighting applications.

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“…It has been observed before that doping of Eu into ZnO does not necessarily lead to red emission. 14 This is because direct energy transfer from ZnO host to the resonant energy levels of Eu 3+ ions is difficult to achieve due to the shorter lifetime of exciton in ZnO (which is of the order of 1 ps) and inherently small absorption coefficient. [15][16][17][18] Furthermore, the luminescence of lanthanoids ions depends critically on their doping locations in the host.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in red emission at room temperature from europium doped ZnO nanowires by 1,10 phenanthroline-europium interface induced resonant excitations

Dhara

Raychaudhuri

2017

AIP Advances

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We show that europium doped ZnO nanowires after surface modification with organic ligand, 1,10 phenanthroline (phen) leads to strong red emission at 613 nm which is a characteristic emission from the atomic levels of Eu3+. Surface modification with phen leads to formation of phenanthroline-europium interface on the surface of the nanowires due to attachment of Eu3+ ions. After an optimized surface modification with phen, intensity of both the UV emission (band edge) and red emission improved by two orders of magnitude at room temperature. We observed multiple energy transfer pathways to the energy levels of Eu3+ ions through the phenanthroline-europium interface, which found to be very effective to the significant enhancement of emission from the dopant Eu3+. This study shows a new insight in to the energy transfer process from phen to the europium doped ZnO system.

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Photoluminescence of Eu-Doped ZnO Phosphors

Cited by 60 publications

References 8 publications

Visible emission from ZnO doped with rare-earth ions

Visible emission from ZnO doped with rare-earth ions

Discovery and Optimization of New ZnO‐Based Phosphors Using a Combinatorial Method

Enhancement in red emission at room temperature from europium doped ZnO nanowires by 1,10 phenanthroline-europium interface induced resonant excitations

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