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5th LED professional Symposium +Expo: Call for Papers Now Open

The international program committee for the 5th LED professional Symposium +Expo (LpS) has opened the "Call for Papers". The LpS 2015 will take place from ...

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5th LED professional Symposium +Expo: Call for Papers Now Open

Epistar Acquires 94% of TSMC SSL from TSMC and Subsidiary

Epistar Corp. and Taiwan Semiconductor Manufacturing Co. (TSMC ) held Board of Directors’ meetings today and approved a sale of TSMC Solid State Lighting (TSMC ...

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Determination of the Nitrogen Vacancy as a Shallow Compensating Center in GaN Doped with Divalent Metals

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New research from academics from the University of Bath Department of Chemistry has uncovered the mystery of why blue light-emitting diodes (LEDs) are so difficult to make: (1) Calculated spin density resulting from (a) a Mg0Ga-associated hole localized on a neighboring N in the basal plane, (b) a Mg0Ga-associated hole localized on a neighboring axial N, and (c) a N vacancy. Light gray (green) [darker gray (blue)] spheres represent Ga (N) atoms. The darkest gray sphere represents a Mg atom in (a) and (b) (purple) and a vacancy in (c) (orange). Spin densities are indicated by (red) isosurfaces of density (au) 0.05, 0.025, and 0.01 for (a) and (b) and 0.01, 0.005, 0.0025 for (c). (2) Formation energy of VN (black line) and MgGa [light gray (red) line] as a function of Fermi energy above the VBM. Anion-rich conditions are assumed. The position of the conduction band minimum (CBM) is indicated by the broken line. For each value of Fermi energy, only the most stable defect charge state is shown, with a change in slope indicating a change in charge state

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Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make

Researchers in our Department of Chemistry have collaborated with groups at University College London (UCL) and Daresbury to uncover the mystery of why blue ...

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Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make

Figure 2: Semantic contours for chromaticity differences from the chromaticity center in the CIE x,y chromaticity diagram for a phase of daylight at 6000 K, x= 0.3216; y=0.3377 (light green dot). For detailed explanations, see the caption of Figure 1

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Figure 1: Semantic contours for chromaticity differences from the chromaticity center in the CIE x,y chromaticity diagram for a warm white chromaticity center, the Planckian radiator at 2500 K; x=0.4770; y=0.4137 (light green dot). Going off the center in any direction, contours indicate “good-very good” (green contour), “good” (yellow contour), “moderate-good” (orange contour), “low” (red contour) and “bad” (lilac contour) perceived color agreement with the center. Contours of constant chromaticity differences (Δu’v’=0.001 - Δu’v’=0.007 i.e. approximations of MacAdam ellipses) measured from the chromaticity center are also shown

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Prof. Jiangen Pan

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