layer may be preferably a continuous coating but it may be also formed as incontinuous coating by use of a resin emulsion or a resin dispersion the means for imparting energy to be used during performing heat transfer by use of the heat transfer sheet and the image receiving material as described above may be any imparting means known in the art for example by means of a recording device such as a thermal printer e g video printer vy 100 hitachi k k japan etc by imparting a heat energy of about 5 to 100mj mm 2 by controlling the recording time a desired image can be formed according to the present invention as described above by permitting the compound represented by the above formula i in the dye layer a heat transfer sheet can be provided which can form an image of satisfactory density with lower printing energy as compared with the prior art and also can form an image of further higher density with the same energy as in the prior art such effects may be considered to be due to the fact that since the compound represented by the formula i has the property of melting very easily and sharply by the heat from a thermal.