Session Index

Three psycho-visual experiments are carried out to investigate the visual afterimage characteristics of high luminance LED with different sizes of dot matrix under dark surround conditions. As a result, the intensity level and the use of a diffuser obviously influence the visual characteristics of the afterimage.

 

The temperature of LED surface decreased by adjusting width and height of heat sink, from 90 to 83.6°C and from 96.9 to 80.7°C, respectively. Compared with width, adjusting height of heat sink significantly reduce the temperature by 9.6%

 

Four surface-modified and hence positively-charged metal nanoparticles (NPs) of different localized surface plasmon resonance wavelengths are synthesized for linking with negatively-charged, red-emitting colloidal CdZnSeS/ZnS quantum dots (QDs) on the top surface of a blue-emitting InGaN/GaN quantum well light-emitting diode through electro-static force. The metal NP-QD linkage leads to a short...

 

The leaf-structures are patterned onto top surface of a LED to reduce the total
internal reflection at the smooth interface between the encapsulant and air. The optical
characteristics of the LED covered with the replication of leaf surface structure are measured to
verify the enhancement of the LEDs.

 

Mixing different ratios of perovskite CsPbI3 quantum dots and Trioctylphosphine oxide (TOPO) solutions to explore the difference between them, and further explore the effects of doping TOPO and adding UV-type QD optical glue on perovskite CsPbI3 with TOPO quantum dots, and apply it to color conversion devices.

 

The ICBA:modified C60 electron transport layer (ETL) is proposed for the PeLEDs. As a result of improved perovskite/ETL interfacial quality and uniform carrier distribution within the MAPbBr3, the improvement in the output luminance of the PeLEDs is achieved. Furthermore, PeLED-based optical communication is shown to be feasible.

 

Here we propose Si substrate removal technology for HEMTs to alleviate RF loss. By removing the Si substrate, the power gain cut-off frequency is improved mainly due to a higher output resistance. Finally, we develop a small signal model that includes parasitic elements of the Si substrate.

 

This study evaluates users’ attention levels under different office lighting environments by utilizing electroencephalography and self-evaluated questionnaires. The signal processing involves the combination of Hilbert-Huang transform, probability density function towards spectral power, and receiver operating characteristic curves with their area under the curves.

 

Enhancing device efficiencies of the white light-emitting electrochemical cells (LECs) is realized by employing substrates with embedded diffusive layers containing scattering TiO2 nanoparticles. The maximal external quantum efficiency and power efficiency of the white LECs employing the proposed diffusive substrates reach 22.0% and 41.6 lm W-1, respectively.

 

This paper reports an optical structure design method with the predicted performances of blue organic light-emitting diodes with high blue index. By adjusting the thickness of transport layers, the electroluminescent spectra could be narrowed and enhanced. The blue index could be increased from 71 to over 120.

 

The β-carotene was encapsulated in remote yellow phosphor layer to achieve the white light LEDs with low correlated color temperature (CCT).By combining the yellow phosphor and β-carotene with the blue LED chip, the white light emission of the white LEDs with improved color rendering index (CRI) can be obtained.

 

The plasmonic Dicke effect means a cooperative emission mechanism of multiple light emitters when they are simultaneously coupled with the same surface plasmon (SP) mode of a metal nanostructure to achieve a higher collective emission efficiency. We compare the enhancements of emission efficiency among a series of SP-coupled InGaN/GaN quantum-well..

 

The correlated color temperature, color rendering index, and luminous efficacy of white LEDs with cyan, green and red phosphors in silicone/yellow phosphor in glass at 350 mA were 4200K, 90.9 and 76 lm/W (increase 18.4%), respectively. WLEDs with uniform SPD have improved luminous efficacy through the new phosphor configuration.

 

Since there are many materials which will absorb ultraviolet light, therefore, people are finding different ways to improve luminous power of UVC LEDs in recent years. In this work, we manufacture the omnidirectional reflector on UVC LEDs, which is one of the methods to improve luminous power of UVC LEDs.

 

in this work, a chip on board (COB) was used as a surgical lamp light source.it was found that the center illumiance was 66122 lux. on the other hand,the d50 and d10 was 98 mm and 164mm,respectively.In other word, the d50/d10 was 0.59 (i.e., meet regulation,0.5)

 

This paper investigates the infrared absorption behavior of solid suspended particles in a quantitative way. By using near infrared spectroscopy and partial least squares regression (PLSR), we can explore the changes in concentration caused by the internal transmission of IR light in a real smog-filled environment.

 

In this work, a half mirror with an Al film was formed by using a thermal evaporation. Furthermore, the proposed half mirror can effectively achieve a good mirror effect. In other word, a deep mirror effect can be formed by using an Al mirror and an a half mirror.

 

Light is a non-pharmacological method to improve the sleep cycle, wakefulness, and quality of life. Based on ESP32 micro-controllers, interacting through ESP-NOW protocol. The hardware has been developed to interact with and control 8 LED strips to produce white light with a time-varying CCT.