To enhance the color conversion efficiency of green quantum dots (QDs), hybrid Bragg reflector (HBR) and distributed Bragg reflector (DBR) were respectively stacked on bottom side and over QD slurry layer of the micro-QDs-LEDs. The green light intensity was enhanced by 21.0% in comparison with micro-QDs-LEDs without HBR and DBR.

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This study develop a phosphor template and flip-chip structure to produce uniform phosphor-converted white LEDs using laser lift-off, secondary transferring and surface roughening process. In the experiments, the FRGWB-LED reveals the better luminous flux and good angular correlated color temperature deviation in the range of -80° to +80°.

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This study evaluated the illumination provided by an intelligent luminaire in relation to two operating factors: correlated color temperature and task illuminance, with the presence of a computer monitor. An ergonomic control model based on the subjective brightness perceptions was established to define the satisfactory operating range.

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This study that we doped 2CzPN as the TADF material in red phosphorescent PLED. The triplet's non- radiative decay can be captured by 2CzPN and returned to singlet. The maximum luminance enhanced 112.6% and the EQE enhanced 74.8%. The device have color stable red emission.

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Efficient-speckle-reduction results are demonstrated by using overlapping diversity. The speckle contrast (SC) can be reduced from 38.5% to 7.8% for a MEMS scanning blue image. The almost speckle-free result is achieved. Calculated mixing speckle contrasts show speckle-free results that could be used for illumination and display applications.

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We explores the essential characteristics of LEDs during their aging processes. One empirical model to describe the aging process of LEDs is proposed. Tens of LED bulbs are monitored on their normal operation to failure. Then, three aging characteristics of LEDs are found and analyzed.

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In this paper, the optical models of the four types white light LEDs are built, and the dispersion effects of the WLLED lamps with and without the hemisphere reflectors are compared in simulations and experiments. According to the results, the hemisphere reflector can reduce the maximum dispersion extent to about ten times.

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A high-brightness p-side-up thin-film AlGaInP based light-emitting diodes (LEDs) with textured the AZO thin film by wet etching and ZnO nanorod arrays are presented is studied in this article. The textured AZO layer is deposited on the carbon-doped GaP cap layer by pulsed laser deposition to enhance the light extraction efficiency of LEDs. The output power of p-side-up thin-film AlGaInP LED with the textured AZO layer has improved up to 56.1 % (@ 350 mA) compared with that of LED without AZO film.

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We presented a low efficiency droop green light emitting diodes (LEDs) with a quaternary InAlGaN/GaN superlattice electron blocking layer (SL-EBL). A digital growth of quaternary SL-EBL was demonstrated. Furthermore, the light output power shows a 57% enhancement and only 30% efficiency droop was obtained.

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A novel quantum dots light-emitting diode with laser-processed microscale patterns has been demonstrated for white light emission. Via the pulsed laser ablation, microscale square holes with nano-ripple structures can be directly fabricated onto a sapphire substrate in flip-chip blue LED, confining sprayed quantum dots at specific areas and eliminating the coffee ring effect.

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This study presents a scattered photon extraction structure with a cyclic remote phosphor layer. The scattered photon extraction structure with a cyclic remote phosphor layer would be expected to provide high output power with good color rendering property.

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This study investigates the visual fatigue of media viewing activities under different luminance contrast between indoor display and ambient lighting, in order to establish an adaptive control model.

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A method of simulating laser color speckle by Monte Carlo method and Mie theory has been introduced. Then we used this method to simulate white light generated by laser pumping phosphor. Accordingly, We further discussed the spatial color uniformity (∆u'v') of the phosphor converted white light pumped by different speckled blue laser light.

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The numerical simulation regarding optical and electrical processes simultaneously is vital for designing the device structures of organic light-emitting devices (OLEDs). The aim of this paper is to minimize the times of trial-and-error experiments and unveil the efficient method for optimizing the OLED performance. With the integration of electrical and optical simulations, the numerical data agrees with the experimental results.

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