High-Power III-Nitride Emitters for Solid-State Lighting

Krames, Michael R.; Bhat, J.; Collins, D. M.; Gardner, Nathan F.; Götz, Werner; Lowery, C. H.; Ludowise, M. J.; Martin, P.; Mueller, Gerd; Mueller‐Mach, Regina; Rudaz, Serge; Steigerwald, D. A.; Stockman, S. A.; Wierer, Jonathan J.

doi:10.1002/1521-396x(200208)192:2<237::aid-pssa237>3.0.co;2-i

Cited by 65 publications

(30 citation statements)

References 8 publications

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“…Such high CRI compares favorably to conventional white light sources such as "cool white" fluorescent (CRI ) 62), incandescent (CRI ) 100), and dyeenhanced InGaN/GaN solid-state LEDs (CRI > 80). 25 The peak EQE of our monochrome QD-LEDs are measured to be 1.6% at 4.6 V (0.29 mA/cm 2 ) for red devices, 0.65% at 5.2 V (0.63 mA/cm 2 ) for green, and 0.35% at 9.1 V for blue (1.73 mA/cm 2 ) ( Figure 3). These values are consistent with previously reported QD-LEDs, 2-6 with our green and blue QD-LEDs more efficient than those in previous reports.…”

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confidence: 99%

Electroluminescence from a Mixed Red−Green−Blue Colloidal Quantum Dot Monolayer

et al. 2007

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We demonstrate light emitting devices (LEDs) with a broad spectral emission generated by electroluminescence from a mixed-monolayer of red, green, and blue emitting colloidal quantum dots (QDs) in a hybrid organic/inorganic structure. The colloidal QDs are reproducibly synthesized and yield high luminescence efficiency materials suitable for LED applications. Independent processing of the organic charge transport layers and the QD luminescent layer allows for precise tuning of the emission spectrum without changing the device structure, simply by changing the ratio of different color QDs in the active layer. Spectral tuning is demonstrated through fabrication of white QD-LEDs that exhibit external quantum efficiencies of 0.36% (Commission Internationale de l'Eclairage) coordinates of (0.35, 0.41) at video brightness, and color rendering index of 86 as compared to a 5500 K blackbody reference.

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confidence: 99%

Electroluminescence from a Mixed Red−Green−Blue Colloidal Quantum Dot Monolayer

et al. 2007

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“…17 Another investigation reported that the CCT changed with viewing angle for YAG downconverted white light. 19,20 To further investigate, samples were prepared with only green (GR10) and red (GR01) phosphors in the PMMA host. Both samples exhibited spectral changes with diode power (not shown here).…”

Section: Luminescence Spectramentioning

confidence: 99%

Enhancement of quality of downconverted white light

et al. 2011

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Abstract. High-quality downconverted white light is important for many applications ,including general illumination. Downconversion of blue light from inorganic InGaN-based light emitting diodes to produce white light is demonstrated using red-and green-emitting phosphors. After characterization, films of the phosphors are prepared by mixing the powder into a polymethyl methacrylate host. The quality of light is improved and optimized by varying the weight ratio of green to red phosphors and the thickness of the phosphor layer. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…As shown in Fig. 1(b), the conformal coating technology was first proposed by Lumileds in the pursuit of the precise control of shape, thickness and particle content of phosphor layer [21], [22]. The remote phosphor structure meaning a physical separation of LED chip and phosphor layer was first proposed in 1995 in order to realize improved lifetime and higher luminous efficacy by reducing backscattering and thermal effect caused by LED chip [23], [24], as depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

An Improved Slurry Method of Self-Adaptive Phosphor Coating for White pc-LED Packaging

Rao

Wang

Wan

et al. 2013

J. Display Technol.

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For illumination-grade applications, the spatial homogeneity of the white light emitted is an important issue which is directly associated with the geometry and the composition of the color conversion layer in phosphor-converted LEDs. In order to create a phosphor coating of high quality surrounding the LED chip surface, an improved slurry method with self-exposure technique was applied and investigated. The conformal phosphor layer of self-adaptability to angular intensity distribution of LED emitting light was realized. Plasma treatment was introduced to improve the aging performance of white LEDs with this advanced slurry method. The effect of the self-adaptive coating on the improvement of angular color uniformity of white LEDs was measured and discussed.

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High-Power III-Nitride Emitters for Solid-State Lighting

Cited by 65 publications

References 8 publications

Electroluminescence from a Mixed Red−Green−Blue Colloidal Quantum Dot Monolayer

Electroluminescence from a Mixed Red−Green−Blue Colloidal Quantum Dot Monolayer

Enhancement of quality of downconverted white light

An Improved Slurry Method of Self-Adaptive Phosphor Coating for White pc-LED Packaging

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